Add cupertino docimports for CupertinoPageTransitionsBuilder and fix typos (#182685)

diff --git a/packages/flutter/lib/src/material/page_transitions_theme.dart b/packages/flutter/lib/src/material/page_transitions_theme.dart
index 3d2fb9b..71430fe 100644
--- a/packages/flutter/lib/src/material/page_transitions_theme.dart
+++ b/packages/flutter/lib/src/material/page_transitions_theme.dart
@@ -439,7 +439,7 @@
 ///  * [FadeUpwardsPageTransitionsBuilder], which defines a page transition
 ///    that's similar to the one provided by Android O.
 ///  * [OpenUpwardsPageTransitionsBuilder], which defines a page transition
-///    that's similar to the one provided by Andoird P.
+///    that's similar to the one provided by Android P.
 ///  * [ZoomPageTransitionsBuilder], which defines the default page transition
 ///    that's similar to the one provided in Android Q.
 ///  * [CupertinoPageTransitionsBuilder], which defines a horizontal page
diff --git a/packages/flutter/lib/src/material/predictive_back_page_transitions_builder.dart b/packages/flutter/lib/src/material/predictive_back_page_transitions_builder.dart
index df97c6c..7f29b17 100644
--- a/packages/flutter/lib/src/material/predictive_back_page_transitions_builder.dart
+++ b/packages/flutter/lib/src/material/predictive_back_page_transitions_builder.dart
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+/// @docImport 'package:flutter/cupertino.dart';
+///
 /// @docImport 'page.dart';
 library;
 
@@ -27,7 +29,7 @@
 /// See also:
 ///
 ///  * [PredictiveBackFullscreenPageTransitionsBuilder], which is another
-///    variant of Android's predictive back page transitition.
+///    variant of Android's predictive back page transition.
 ///  * [FadeForwardsPageTransitionsBuilder], which defines the default page transition
 ///    that's similar to the one provided in Android 16.
 ///  * [ZoomPageTransitionsBuilder], which defines the default page transition
diff --git a/packages/flutter/lib/src/widgets/page_transitions_builder.dart b/packages/flutter/lib/src/widgets/page_transitions_builder.dart
index 8a1a747..e5867cf 100644
--- a/packages/flutter/lib/src/widgets/page_transitions_builder.dart
+++ b/packages/flutter/lib/src/widgets/page_transitions_builder.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+/// @docImport 'package:flutter/cupertino.dart';
 /// @docImport 'package:flutter/material.dart';
 library;