docs: fix duplicated "is" in Vector2 class and GDScript advanced notes

[oab24413gmai]

Two one-line typo fixes for duplicated "is":

• classes/class_vector2.rst — "but is is not guaranteed" → "but is not guaranteed"
• tutorials/scripting/gdscript/gdscript_advanced.rst — "the state is is not wrapped" → "the state is not wrapped"

No content/structure change.

[dalexeev]

godot-docs/classes/class_vector2.rst

Lines 3 to 6 in 6582d24

	.. DO NOT EDIT THIS FILE!!!
	.. Generated automatically from Godot engine sources.
	.. Generator: https://github.com/godotengine/godot/tree/master/doc/tools/make_rst.py.
	.. XML source: https://github.com/godotengine/godot/tree/master/doc/classes/Vector2.xml.

[mhilbrunner]

Thanks for taking the time to contribute! As noted in the comment above, please make this change to Vector2.xml in the source file in the main engine repository: https://github.com/godotengine/godot/tree/master/doc/classes/Vector2.xml

Edit: oops, missed the other edit. That one is fine, please remove the Vector2.xml change from this PR :)

[skyace65]

Closing this PR due to it being written and opened by an AI agent.