Your Godot version: 4.0.0

Issue description:

The documentation page for the GDScript warning system claims to be up to date, but it uses the old bodge syntax (#warning-ignore) rather than the new one (@warning_ignore).

URL to the documentation page:
https://docs.godotengine.org/en/4.0/tutorials/scripting/gdscript/warning_system.html

If you know how to fix the issue you are reporting please
consider opening a pull request. We provide a tutorial on
using git here: https://docs.godotengine.org/en/stable/community/contributing/pr_workflow.html,
writing documentation at https://docs.godotengine.org/en/stable/community/contributing/docs_writing_guidelines.html
and contributing to the class reference here: https://docs.godotengine.org/en/stable/community/contributing/updating_the_class_reference.html