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.
(cherry picked from commit 7adf4cc9b5)
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.
Adds a new NavigationMesh property to select which objects will be taken
into account for the generation.
By default it will use all the NavigationMeshInstance children to keep
compatibility. The new modes allow to build the NavigationMesh from
all the nodes belonging to a specific group, and optionally include
their children too.
