docs: fix typo in element wrappers article

[SoulSniper1212]

Overview:
This PR fixes a minor typo in the element wrappers documentation where "withing" was incorrectly used instead of "within". This improves the readability and professionalism of the documentation.

Checklist:

• Code changes are complete
• Tests pass
• Documentation updated (if applicable)

Proof that changes are correct:
The change is a simple typo correction that was manually verified. The documentation now correctly spells "within" in the heading and surrounding text, maintaining consistency with standard English usage.