62755 Add punctuation for unterminated sentences in doc comments (a: accessibility, a: internationalization, a: tests, cla: yes, d: api docs, documentation, f: cupertino, f: material design, framework, tool)

62761 Fix lifecycle clean up in the material date picker tests for screen size and semantics. (a: internationalization, cla: yes, f: material design, framework, waiting for tree to go green)

62778 text selection affinity can be null on web (cla: yes, framework, waiting for tree to go green)

62788 Add onTertiaryTap* to TapGestureRecognizer and GestureDetector (a: accessibility, cla: yes, framework, waiting for tree to go green)

62792 Remove mistakenly added DartDevelopmentService dependency (cla: yes, tool)