62602 Fix doc warnings for focus code (cla: yes, framework)

62605 [flutter_tools]Set plugin template min flutter sdk version to 1.20 (cla: yes, tool, waiting for tree to go green)

62608 Add daemon handler to start devtools (cla: yes, tool, waiting for tree to go green)

62611 Alphabetize warning list (cla: yes, waiting for tree to go green)

62614 Make dartdoc warnings fatal for flutter_test (cla: yes, framework, team, waiting for tree to go green)

62615 Fix SliverList scrollOffsetCorrection 0 case (cla: yes, f: scrolling, framework, severe: crash, severe: regression, waiting for tree to go green)