Missing docs for how to work with and usage Shortcuts

[kristianmandrup]

Your Godot version:

4.4.1

Issue description:

Unable to figure out how to work with or create shortcuts in code via https://docs.godotengine.org/en/4.4/classes/class_shortcut.html#class-shortcut

URL to the documentation page (if already existing):

The Shortcut class page should include examples of how to use the API or at least reference some pages on the docs which demonstrates how it can be used. Thanks.