Warning handling in doc build is inconsistent #2800
Description
Our warning handling is inconsistent in how some warnings are treated as fatal errors.
Consistency checks within Sphinx produce warnings which get treated as errors, yet these errors from #2799's CI runs do not :
WARNING: No members parsed for 'arcade.types.numbers' with inferred path PosixPath('/home/runner/work/arcade/arcade/arcade/types/numbers.py'). Check & update yourconfig?
WARNING: No members parsed for 'arcade.sprite.enums' with inferred path PosixPath('/home/runner/work/arcade/arcade/arcade/sprite/enums.py'). Check & update yourconfig?
WARNING: No members parsed for 'arcade.sprite_list' with inferred path PosixPath('/home/runner/work/arcade/arcade/arcade/sprite_list/__init__.py'). Check & update yourconfig?
WARNING: No members parsed for 'arcade.texture' with inferred path PosixPath('/home/runner/work/arcade/arcade/arcade/texture/__init__.py'). Check & update yourconfig?
WARNING: No members parsed for 'arcade.texture_atlas' with inferred path PosixPath('/home/runner/work/arcade/arcade/arcade/texture_atlas/__init__.py'). Check & update yourconfig?