[meta] Inconsistent capitalization in module name / menu links

Problem/Motivation

Examples UI capitalization should be consistent across modules.

This issue will be a meta for various types of work.

Proposed resolution

Module names should be capitalized, like "Content Entity Example". #2897096: Capitalize all module names

Route titles should be capitalized according to heirarchy. For instance, the top-level route "Form API Examples" should be fully capitalized, but child paths should be capitalized on the first word and then lower-case, like "Simple form" #2897630: Properly capitalize all route/link names

Toolbar titles should have the same title as the path they link. See "Stream Wrapper example", which should be fully-capitalized. Note: toolbar titles are derived from route titles, so no further action is needed after #2897630: Properly capitalize all route/link names

Remaining tasks

User interface changes

API changes

Data model changes