Remove reference to "icon" (must have been a copy-paste error) & clarify where to find out what names & node_types are valid.
(cherry picked from commit d397c32169)
We already removed it from the online docs with #35132.
Currently it can only be "Built-In Types" (Variant types) or "Core"
(everything else), which is of limited use.
We might also want to consider dropping it from `ClassDB` altogether
in Godot 4.0.
- Document a few more properties and methods
- Add more information to many classes
- Fix lots of typos and gramar mistakes
- Use [code] tags for parameters consistently
- Use [b] and [i] tags consistently
- Put "Warning:" and "Note:" on their own line to be more visible,
and make them always bold
- Tweak formatting in code examples to be more readable
- Use double quotes consistently
- Add more links to third-party technologies
While the master branch is in development state for the next stable branch,
its links should point to the "latest" docs branch, to ensure that users of
the unstable builds are linked to the relevant documentation.
Those links could be switched to stable branch subdomains before branching
off for a new major or minor release, to start tracking the frozen stable
docs branches.
See discussion in #29104.
