docs: fix grammar and punctuation in Copilot Extension Developer Policy

[SupriyaJaiswal7]

This PR fixes minor grammar and punctuation issues in the GitHub Copilot Extension Developer Policy.

• Corrected "we means" → "we mean" (typo) in the Personal Data definition.
• Removed an extraneous word ("within") that broke sentence flow in Section 1.
• Added a missing comma after the subordinate clause in Section 1 for clarity.

These are non-functional, documentation-only changes intended to improve readability.

No code changes. No policy changes. Small copy edits only.

[github-actions]

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Table of review links

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Source	Review	Production	What Changed
site-policy/github-terms/github-copilot-extension-developer-policy.md	fpt	fpt

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Copilot]

Pull request overview

This PR corrects minor grammar and punctuation errors in the GitHub Copilot Extension Developer Policy to improve readability and correctness.

Key changes:

• Fixed subject-verb agreement error in the Personal Data definition
• Removed an extraneous word disrupting sentence flow in Section 1
• Added proper comma punctuation after a subordinate clause in Section 1

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[SupriyaJaiswal7]

Confirmed: only three minor copy edits (typo fix; removed extraneous word; added comma).
Happy to adjust wording if needed.