Fix initialization typos in GDExtension manual

[catwasd]

Description

This PR fixes the initilization typos in Scripting/Programming/GDExtension manual page.

The important function is the third function called example_library_init. We first call a function in our bindings library that creates an initilization object. This object registrates the initialization and termination functions of the GDExtension. Furthermore, it sets the level of initilization (core, servers, scene, editor, level).

Link: https://docs.godotengine.org/en/stable/tutorials/scripting/gdextension/gdextension_cpp_example.html

Typos found in:

• Master
• 4.0
• 4.1
• Latest

[catwasd]

Can be tagged with cherrypick:4.0 and cherrypick:4.1

[mhilbrunner]

Well spotted, thanks for fixing this and congrats on your first merged contribution! We'll cherrypick this to the other branches eventually.