63313 Small documentation typo fix (d: api docs, documentation, framework, waiting for tree to go green)

63347 Some minor improvements to the AsyncSnapshot API (framework, waiting for tree to go green)

63352 Clip image of BoxDecoration to circle when shape is BoxShape.circle (a: quality, framework, waiting for tree to go green)

63390 update for WidgetTester.move and WidgetTester.fling doc (a: tests, framework, waiting for tree to go green)

63396 Fixed an ElevatedButton API doc typo (f: material design, framework)

63401 Make textfields restorable (cla: yes, f: cupertino, f: material design, framework)

63405 Ensure cupertino time picker positions hours and minutes correctly for RTL (a: internationalization, f: cupertino, framework)