87929 [docs] spelling correction for showModalBottomSheet docs in bottom sheet file (framework, f: material design, cla: yes, waiting for tree to go green)

87949 Small Doc improvements: default value for enableInteractiveSelection. (framework, cla: yes, waiting for tree to go green)

87962 Fix errors in examples (a: tests, tool, framework, f: material design, cla: yes, waiting for tree to go green)

87971 [EditableText] call onSelectionChanged only when there are actual selection/cause changes (framework, f: material design, cla: yes, f: cupertino, waiting for tree to go green)

87973 [TextInput] minor fixes (framework, cla: yes, waiting for tree to go green)

88019 add ? in Checkbox onChanged property (framework, f: material design, cla: yes, waiting for tree to go green)