We still had a few deprecated assignements of `bpy.props.xxx` to class
members in our API documentation and one of our py tests. Annotations
are to be used now.
Also remove the section about `register_module` utils, this has been
removed in 2.8.
Fix T71877: Python API overview sample code warning: class MyMaterialProps contains a property which should be an annotation!
Fix T71876: Python API overview references old bpy.utils.register_module function
- Blender/Python Addon Tutorial: a step by step guide on how to write an addon from scratch
- Blender/Python API Reference Usage: examples of how to use the API reference docs
Thanks to John Nyquist for editing these docs and giving feedback.