Fix links in package example readmes (#3130)

http://flutter.io/ -> https://flutter.dev/
diff --git a/packages/android_alarm_manager/example/README.md b/packages/android_alarm_manager/example/README.md
index 476cf13..0df1ed9 100644
--- a/packages/android_alarm_manager/example/README.md
+++ b/packages/android_alarm_manager/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/android_intent/example/README.md b/packages/android_intent/example/README.md
index a2bc524..460d46e 100644
--- a/packages/android_intent/example/README.md
+++ b/packages/android_intent/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/battery/battery/example/README.md b/packages/battery/battery/example/README.md
index dcb94ed..ac3fc4d 100644
--- a/packages/battery/battery/example/README.md
+++ b/packages/battery/battery/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/device_info/device_info/example/README.md b/packages/device_info/device_info/example/README.md
index 36ca6cc..ea47551 100644
--- a/packages/device_info/device_info/example/README.md
+++ b/packages/device_info/device_info/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/google_maps_flutter/google_maps_flutter/example/README.md b/packages/google_maps_flutter/google_maps_flutter/example/README.md
index 8003873..b92b9c3 100644
--- a/packages/google_maps_flutter/google_maps_flutter/example/README.md
+++ b/packages/google_maps_flutter/google_maps_flutter/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](https://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/google_sign_in/google_sign_in/example/README.md b/packages/google_sign_in/google_sign_in/example/README.md
index 78b7274..0e246e1 100755
--- a/packages/google_sign_in/google_sign_in/example/README.md
+++ b/packages/google_sign_in/google_sign_in/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/image_picker/image_picker/example/README.md b/packages/image_picker/image_picker/example/README.md
index 4a33db1..129aa85 100755
--- a/packages/image_picker/image_picker/example/README.md
+++ b/packages/image_picker/image_picker/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/local_auth/example/README.md b/packages/local_auth/example/README.md
index da6cf0c..a4a6091 100644
--- a/packages/local_auth/example/README.md
+++ b/packages/local_auth/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/package_info/example/README.md b/packages/package_info/example/README.md
index 4ca7966..762d04e 100644
--- a/packages/package_info/example/README.md
+++ b/packages/package_info/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/path_provider/path_provider/example/README.md b/packages/path_provider/path_provider/example/README.md
index f1564c6..1f8ea71 100644
--- a/packages/path_provider/path_provider/example/README.md
+++ b/packages/path_provider/path_provider/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/path_provider/path_provider_macos/example/README.md b/packages/path_provider/path_provider_macos/example/README.md
index c817502..4f41387 100644
--- a/packages/path_provider/path_provider_macos/example/README.md
+++ b/packages/path_provider/path_provider_macos/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/path_provider/path_provider_windows/example/README.md b/packages/path_provider/path_provider_windows/example/README.md
index f3ca03f..32f66a8 100644
--- a/packages/path_provider/path_provider_windows/example/README.md
+++ b/packages/path_provider/path_provider_windows/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/quick_actions/example/README.md b/packages/quick_actions/example/README.md
index 86cefd0..d1b7289 100644
--- a/packages/quick_actions/example/README.md
+++ b/packages/quick_actions/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/sensors/example/README.md b/packages/sensors/example/README.md
index b245412..9e7d7e0 100644
--- a/packages/sensors/example/README.md
+++ b/packages/sensors/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/share/example/README.md b/packages/share/example/README.md
index 189be05..4081c8a 100644
--- a/packages/share/example/README.md
+++ b/packages/share/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/shared_preferences/shared_preferences/example/README.md b/packages/shared_preferences/shared_preferences/example/README.md
index 9d3bf1f..7dd9e9c 100644
--- a/packages/shared_preferences/shared_preferences/example/README.md
+++ b/packages/shared_preferences/shared_preferences/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/shared_preferences/shared_preferences_linux/example/README.md b/packages/shared_preferences/shared_preferences_linux/example/README.md
index 9d3bf1f..7dd9e9c 100644
--- a/packages/shared_preferences/shared_preferences_linux/example/README.md
+++ b/packages/shared_preferences/shared_preferences_linux/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/shared_preferences/shared_preferences_macos/example/README.md b/packages/shared_preferences/shared_preferences_macos/example/README.md
index 9d3bf1f..7dd9e9c 100644
--- a/packages/shared_preferences/shared_preferences_macos/example/README.md
+++ b/packages/shared_preferences/shared_preferences_macos/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/url_launcher/url_launcher/example/README.md b/packages/url_launcher/url_launcher/example/README.md
index 28dd90d..c200da8 100644
--- a/packages/url_launcher/url_launcher/example/README.md
+++ b/packages/url_launcher/url_launcher/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/url_launcher/url_launcher_macos/example/README.md b/packages/url_launcher/url_launcher_macos/example/README.md
index 28dd90d..c200da8 100644
--- a/packages/url_launcher/url_launcher_macos/example/README.md
+++ b/packages/url_launcher/url_launcher_macos/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/video_player/video_player/example/README.md b/packages/video_player/video_player/example/README.md
index 55b086b..8ceb0ff 100644
--- a/packages/video_player/video_player/example/README.md
+++ b/packages/video_player/video_player/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](http://flutter.io/).
+[documentation](https://flutter.dev/).
diff --git a/packages/webview_flutter/example/README.md b/packages/webview_flutter/example/README.md
index bf2f819..850ee74 100644
--- a/packages/webview_flutter/example/README.md
+++ b/packages/webview_flutter/example/README.md
@@ -5,4 +5,4 @@
 ## Getting Started
 
 For help getting started with Flutter, view our online
-[documentation](https://flutter.io/).
+[documentation](https://flutter.dev/).