60222 Doc Updates (cla: yes, d: api docs, d: examples, documentation, f: scrolling, framework, waiting for tree to go green)

60482 Fix docs for TabBar indicator (cla: yes, d: api docs, documentation, f: material design, framework, waiting for tree to go green)

60726 Doc and Error Message Improvements (a: animation, a: annoyance, a: error message, a: quality, a: text input, cla: yes, d: api docs, d: examples, documentation, f: cupertino, f: material design, framework, waiting for tree to go green)

60734 Add comment explain dispatchEvent override (a: tests, cla: yes, documentation, framework)

60929 Adding CupertinoApp Sample templates (cla: yes, d: api docs, d: examples, documentation, f: cupertino, framework, team, waiting for tree to go green)