fix some formatting issues (#25474)

packages/flutter/lib/src/animation/tween_sequence.dart

@@ -34,7 +34,7 @@ import 'tween.dart';
 ///     ),
 ///   ],
 /// ).animate(myAnimationController);
-///```
+/// ```
 class TweenSequence<T> extends Animatable<T> {
   /// Construct a TweenSequence.
   ///

packages/flutter/lib/src/cupertino/date_picker.dart

@@ -1340,4 +1340,4 @@ class _CupertinoTimerPickerState extends State<CupertinoTimerPicker> {
       child: picker,
     );
   }
-}
\ No newline at end of file
+}

packages/flutter/lib/src/cupertino/dialog.dart

@@ -1694,4 +1694,4 @@ class _RenderCupertinoDialogActions extends RenderBox
   bool hitTestChildren(HitTestResult result, { Offset position }) {
     return defaultHitTestChildren(result, position: position);
   }
-}
\ No newline at end of file
+}

packages/flutter/lib/src/foundation/diagnostics.dart

@@ -474,7 +474,7 @@ final TextTreeConfiguration transitionTextConfiguration = TextTreeConfiguration(
 ///   <name>: <description>:
 ///     <properties>
 ///     <children>
-///```
+/// ```
 ///
 /// See also:
 ///

packages/flutter/lib/src/painting/image_provider.dart

@@ -664,7 +664,7 @@ class MemoryImage extends ImageProvider<MemoryImage> {
 /// AssetImage('icons/heart.png', scale: 1.5)
 /// ```
 ///
-///## Assets in packages
+/// ## Assets in packages
 ///
 /// To fetch an asset from a package, the [package] argument must be provided.
 /// For instance, suppose the structure above is inside a package called
@@ -690,7 +690,7 @@ class MemoryImage extends ImageProvider<MemoryImage> {
 /// lib/backgrounds/background1.png
 /// lib/backgrounds/background2.png
 /// lib/backgrounds/background3.png
-///```
+/// ```
 ///
 /// To include, say the first image, the `pubspec.yaml` of the app should specify
 /// it in the `assets` section:

packages/flutter/lib/src/painting/image_resolution.dart

@@ -105,7 +105,7 @@ const String _kAssetManifestFileName = 'AssetManifest.json';
 /// lib/backgrounds/background1.png
 /// lib/backgrounds/background2.png
 /// lib/backgrounds/background3.png
-///```
+/// ```
 ///
 /// To include, say the first image, the `pubspec.yaml` of the app should specify
 /// it in the `assets` section:

packages/flutter/lib/src/painting/text_style.dart

@@ -140,7 +140,7 @@ const String _kColorForegroundWarning = 'Cannot provide both a color and a foreg
 ///
 /// Custom fonts can be declared in the `pubspec.yaml` file as shown below:
 ///
-///```yaml
+/// ```yaml
 /// flutter:
 ///   fonts:
 ///     - family: Raleway
@@ -155,7 +155,7 @@ const String _kColorForegroundWarning = 'Cannot provide both a color and a foreg
 ///          - asset: fonts/Schyler-Regular.ttf
 ///          - asset: fonts/Schyler-Italic.ttf
 ///            style: italic
-///```
+/// ```
 ///
 /// The `family` property determines the name of the font, which you can use in
 /// the [fontFamily] argument. The `asset` property is a path to the font file,
@@ -197,7 +197,7 @@ const String _kColorForegroundWarning = 'Cannot provide both a color and a foreg
 ///
 /// Then the app can declare a font like in the example below:
 ///
-///```yaml
+/// ```yaml
 /// flutter:
 ///   fonts:
 ///     - family: Raleway
@@ -205,14 +205,14 @@ const String _kColorForegroundWarning = 'Cannot provide both a color and a foreg
 ///         - asset: assets/fonts/Raleway-Regular.ttf
 ///         - asset: packages/my_package/fonts/Raleway-Medium.ttf
 ///           weight: 500
-///```
+/// ```
 ///
 /// The `lib/` is implied, so it should not be included in the asset path.
 ///
 /// In this case, since the app locally defines the font, the TextStyle is
 /// created without the `package` argument:
 ///
-///```dart
+/// ```dart
 /// const TextStyle(fontFamily: 'Raleway')
 /// ```
 ///

packages/flutter/lib/src/widgets/automatic_keep_alive.dart

@@ -396,4 +396,4 @@ mixin AutomaticKeepAliveClientMixin<T extends StatefulWidget> on State<T> {
       _ensureKeepAlive();
     return null;
   }
-}
\ No newline at end of file
+}

packages/flutter/lib/src/widgets/page_storage.dart

@@ -27,9 +27,9 @@ import 'framework.dart';
 ///     MyScrollableTabView(
 ///       key: PageStorageKey<String>(tab.text), // like 'Tab 1'
 ///       tab: tab,
-///    ),
-///  }),
-///)
+///     ),
+///   }),
+/// )
 /// ```
 class PageStorageKey<T> extends ValueKey<T> {
   /// Creates a [ValueKey] that defines where [PageStorage] values will be saved.

packages/flutter/test/cupertino/action_sheet_test.dart

@@ -970,4 +970,4 @@ Widget boilerplate(Widget child) {
     textDirection: TextDirection.ltr,
     child: child,
   );
-}
\ No newline at end of file
+}

packages/flutter/test/cupertino/bottom_tab_bar_test.dart

@@ -332,4 +332,4 @@ void main() {
         decoratedBoxHiddenBorder.decoration;
     expect(boxDecorationHiddenBorder.border, isNull);
   });
-}
\ No newline at end of file
+}

packages/flutter/test/cupertino/dialog_test.dart

@@ -1015,4 +1015,4 @@ Widget boilerplate(Widget child) {
     textDirection: TextDirection.ltr,
     child: child,
   );
-}
\ No newline at end of file
+}

packages/flutter/test/material/dialog_theme_test.dart

@@ -128,4 +128,4 @@ void main() {
       skip: !Platform.isLinux,
     );
   });
-}
\ No newline at end of file
+}

packages/flutter/test/material/flexible_space_bar_collapse_mode_test.dart

@@ -249,4 +249,4 @@ Future<void> slowDrag(WidgetTester tester, Key widget, Offset offset) async {
   await gesture.moveBy(offset);
   await tester.pump(const Duration(milliseconds: 10));
   await gesture.up();
-}
\ No newline at end of file
+}

packages/flutter/test/material/reorderable_list_test.dart

@@ -937,4 +937,4 @@ class _StatefulState extends State<_Stateful> {
       ),
     );
   }
-}
\ No newline at end of file
+}

packages/flutter_driver/test/common.dart

@@ -24,4 +24,4 @@ void tryToDelete(Directory directory) {
   } on FileSystemException catch (error) {
     print('Failed to delete ${directory.path}: $error');
   }
-}
\ No newline at end of file
+}

packages/flutter_test/test/matchers_test.dart

@@ -630,4 +630,4 @@ class _FakeSemanticsNode extends SemanticsNode {
   SemanticsData data;
   @override
   SemanticsData getSemanticsData() => data;
-}
\ No newline at end of file
+}

packages/flutter_tools/test/base/process_test.dart

@@ -92,4 +92,4 @@ void main() {
   });
 }
 
-class PlainMockProcessManager extends Mock implements ProcessManager {}
\ No newline at end of file
+class PlainMockProcessManager extends Mock implements ProcessManager {}

packages/flutter_tools/test/ios/ios_workflow_test.dart

@@ -381,4 +381,4 @@ class CocoaPodsTestTarget extends CocoaPodsValidator {
 
   @override
   final bool hasHomebrew;
-}
\ No newline at end of file
+}