Dismissible not dismissable (#26911)

examples/flutter_gallery/lib/gallery/demos.dart

@@ -159,7 +159,7 @@ List<GalleryDemo> _buildGalleryDemos() {
     ),
     GalleryDemo(
       title: 'Bottom sheet: Modal',
-      subtitle: 'A dismissable bottom sheet',
+      subtitle: 'A dismissible bottom sheet',
       icon: GalleryIcons.bottom_sheets,
       category: _kMaterialComponents,
       routeName: ModalBottomSheetDemo.routeName,

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

@@ -231,7 +231,7 @@ class CupertinoPageRoute<T> extends PageRoute<T> {
     // with forms, then do not allow the user to dismiss the route with a swipe.
     if (route.hasScopedWillPopCallback)
       return false;
-    // Fullscreen dialogs aren't dismissable by back swipe.
+    // Fullscreen dialogs aren't dismissible by back swipe.
     if (route.fullscreenDialog)
       return false;
     // If we're in an animation already, we cannot be manually swiped.

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

@@ -60,7 +60,7 @@ class ModalBarrier extends StatelessWidget {
   ///    the [ModalBarrier] built by [ModalRoute] pages.
   final bool barrierSemanticsDismissible;
 
-  /// Semantics label used for the barrier if it is [dismissable].
+  /// Semantics label used for the barrier if it is [dismissible].
   ///
   /// The semantics label is read out by accessibility tools (e.g. TalkBack
   /// on Android and VoiceOver on iOS) when the barrier is focused.
@@ -147,7 +147,7 @@ class AnimatedModalBarrier extends AnimatedWidget {
   ///    [AnimatedModalBarrier] built by [ModalRoute] pages.
   final bool dismissible;
 
-  /// Semantics label used for the barrier if it is [dismissable].
+  /// Semantics label used for the barrier if it is [dismissible].
   ///
   /// The semantics label is read out by accessibility tools (e.g. TalkBack
   /// on Android and VoiceOver on iOS) when the barrier is focused.

packages/flutter/test/painting/decoration_test.dart

@@ -71,7 +71,7 @@ class DelayedImageProvider extends ImageProvider<DelayedImageProvider> {
   }
 
   @override
-  String toString() => '${describeIdentity(this)}}()';
+  String toString() => '${describeIdentity(this)}()';
 }
 
 class TestImage implements ui.Image {