Fix circle antialiasing in the animation demo (#5729)

examples/flutter_gallery/lib/demo/animation_demo.dart

@@ -74,6 +74,7 @@ class _PointDemoPainter extends CustomPainter {
       drawPoint(canvas, arc.center, Colors.grey[400]);
 
     paint
+      ..isAntiAlias = false // Work-around for github.com/flutter/flutter/issues/5720
       ..color = Colors.green[500].withOpacity(0.25)
       ..strokeWidth = 4.0
       ..style = PaintingStyle.stroke;

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

@@ -41,8 +41,8 @@ typedef double SnapOffsetCallback(double scrollOffset, Size containerSize);
 
 /// A base class for scrollable widgets.
 ///
-/// Commonly used subclasses include [ScrollableList], [ScrollableGrid], and
-/// [ScrollableViewport].
+/// Commonly used classes that are based on Scrollable include [ScrollableList],
+/// [ScrollableGrid], and [ScrollableViewport].
 ///
 /// Widgets that subclass [Scrollable] typically use state objects that subclass
 /// [ScrollableState].