61710 Added expandedHeight in flexibleSpace and flexibleSpaceBar (cla: yes, d: api docs, documentation, f: material design, framework, waiting for tree to go green)

61773 Update framePolicy docs (a: tests, cla: yes, d: api docs, documentation, framework, waiting for tree to go green)

61796 Improved docs for minLines in EditableText (a: text input, cla: yes, d: api docs, documentation, framework, waiting for tree to go green)

61948 Add LayoutBuilder example (cla: yes, d: api docs, d: examples, documentation, framework, waiting for tree to go green)

62083 Update the documentation of GlobalKey to explain why it is expensive (cla: yes, d: api docs, documentation, framework, waiting for tree to go green)