77107 Improve error messaging and documentation for Scrollbar.isAlwaysShown (a: error message, cla: yes, d: api docs, d: examples, documentation, f: scrolling, framework, waiting for tree to go green)

77118 Align more closely with package:test (a: accessibility, a: tests, cla: yes, d: examples, f: material design, framework, team, tool, waiting for tree to go green)

77327 Fix typo (cla: yes, d: examples, team)

77606 [Docs] RouteObserver cannot subscribe ModalRoute (cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

77868 Update samples to use repo analysis options, Fix sample templates and a ton of analyzer issues (cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)