Mention the Data paths documentation in the File class
Mention the Data paths documentation in the File class

This closes https://github.com/godotengine/godot-docs/issues/3799.

(cherry picked from commit d4085d6bfb3ae8e3db79db2d76f77213e576d2a6)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot