For the time being we don't support writing a description for those, preferring
having all details in the method's description.
Using self-closing tags saves half the lines, and prevents contributors from
thinking that they should write the argument or return documentation there.
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.
This commit adds new functionality to NativeScript, namely:
- ability to set and get documentation for classes, methods,
signals and properties
- ability to set names and type information to method arguments
- ability to set and get type tags for nativescripts
- ability to register instance binding data management functions
- ability to use instance binding data
