tweak the layout for the ios doctor checks (#9306)

packages/flutter_tools/lib/src/base/logger.dart

diff --git a/packages/flutter_tools/lib/src/base/logger.dart b/packages/flutter_tools/lib/src/base/logger.dart
index 4cb5b4a..b668ef2 100644
--- a/packages/flutter_tools/lib/src/base/logger.dart
+++ b/packages/flutter_tools/lib/src/base/logger.dart
@@ -271,10 +271,14 @@
   String bolden(String message) {
     if (!supportsColor)
       return message;
-    final StringBuffer result = new StringBuffer();
+    final StringBuffer buffer = new StringBuffer();
     for (String line in message.split('\n'))
-      result.writeln('$_bold$line$_reset');
-    return result.toString();
+      buffer.writeln('$_bold$line$_reset');
+    final String result = buffer.toString();
+    // avoid introducing a new newline to the emboldened text
+    return (!message.endsWith('\n') && result.endsWith('\n'))
+        ? result.substring(0, result.length - 1)
+        : result;
   }
 
   String clearScreen() => supportsColor ? _clear : '\n\n';

packages/flutter_tools/lib/src/doctor.dart

diff --git a/packages/flutter_tools/lib/src/doctor.dart b/packages/flutter_tools/lib/src/doctor.dart
index 4e633aa..3bac2cc 100644
--- a/packages/flutter_tools/lib/src/doctor.dart
+++ b/packages/flutter_tools/lib/src/doctor.dart
@@ -108,14 +108,9 @@
 
   /// Print verbose information about the state of installed tooling.
   Future<bool> diagnose() async {
-    bool firstLine = true;
     bool doctorResult = true;
 
     for (DoctorValidator validator in validators) {
-      if (!firstLine)
-        printStatus('');
-      firstLine = false;
-
       final ValidationResult result = await validator.validate();
 
       if (result.type == ValidationType.missing)
@@ -134,6 +129,8 @@
           printStatus('    • $text');
         }
       }
+
+      printStatus('');
     }
 
     return doctorResult;

packages/flutter_tools/lib/src/ios/ios_workflow.dart

diff --git a/packages/flutter_tools/lib/src/ios/ios_workflow.dart b/packages/flutter_tools/lib/src/ios/ios_workflow.dart
index ba4d2d9..018469d 100644
--- a/packages/flutter_tools/lib/src/ios/ios_workflow.dart
+++ b/packages/flutter_tools/lib/src/ios/ios_workflow.dart
@@ -136,9 +136,9 @@
         messages.add(new ValidationMessage.error(
           'ideviceinstaller not available; this is used to discover connected iOS devices.\n'
           'To install, run:\n'
-          'brew update\n'
-          'brew install --HEAD libimobiledevice\n'
-          'brew install ideviceinstaller'
+          '  brew update\n'
+          '  brew install --HEAD libimobiledevice\n'
+          '  brew install ideviceinstaller'
         ));
       }
 
@@ -151,14 +151,14 @@
         if (hasIosDeploy) {
           messages.add(new ValidationMessage.error(
             'ios-deploy out of date ($iosDeployMinimumVersion is required). To upgrade:\n'
-            'brew update\n'
-            'brew upgrade ios-deploy'
+            '  brew update\n'
+            '  brew upgrade ios-deploy'
           ));
         } else {
           messages.add(new ValidationMessage.error(
             'ios-deploy not installed. To install:\n'
-            'brew update\n'
-            'brew install ios-deploy'
+            '  brew update\n'
+            '  brew install ios-deploy'
           ));
         }
       } else {
@@ -169,9 +169,9 @@
           brewStatus = ValidationType.partial;
           messages.add(new ValidationMessage.error(
             'libimobiledevice is incompatible with the installed Xcode version. To update, run:\n'
-            'brew update\n'
-            'brew uninstall --ignore-dependencies libimobiledevice\n'
-            'brew install --HEAD libimobiledevice'
+            '  brew update\n'
+            '  brew uninstall --ignore-dependencies libimobiledevice\n'
+            '  brew install --HEAD libimobiledevice'
           ));
         }
       }
@@ -182,16 +182,16 @@
         if (!hasCocoaPods) {
           messages.add(new ValidationMessage.error(
             'CocoaPods not installed. To install:\n'
-            'brew update\n'
-            'brew install cocoapods\n'
-            'pod setup'
+            '  brew update\n'
+            '  brew install cocoapods\n'
+            '  pod setup'
           ));
         } else {
           messages.add(new ValidationMessage.error(
             'CocoaPods out of date ($cocoaPodsMinimumVersion is required). To upgrade:\n'
-            'brew update\n'
-            'brew upgrade cocoapods\n'
-            'pod setup'
+            '  brew update\n'
+            '  brew upgrade cocoapods\n'
+            '  pod setup'
           ));
         }
       }