60136 Add more documentation on why tests might hang when using runAsync (a: tests, cla: yes, framework, waiting for tree to go green)

60139 Fix a couple of doc typos. (cla: yes, f: material design, framework, waiting for tree to go green)

60141 Tweaking Material Chip a11y semantics to match buttons (a: accessibility, cla: yes, customer: money (g3), f: material design, framework)

60152 Remove unused physicalDepth code (a: tests, cla: yes, customer: fuchsia, framework, waiting for tree to go green)

60219 Update inaccurate documentation for isUtf16Surrogate method (cla: yes, framework, waiting for tree to go green)

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