Fix typos: vesions → versions in copilot-feature-matrix

[EoinTrial]

Why:

Straightforward typo-fix.

What's being changed (if available, include any code snippets, screenshots, or gifs):

Fixed 6 instances of vesions → versions, found using codespell, in content/copilot/reference/copilot-feature-matrix.md.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff. - I'm a technical author.
• The changes in this PR meet the docs fundamentals that are required for all content. - No substantive content changes, spelling-related fixes only.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

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Source	Review	Production	What Changed
copilot/reference/copilot-feature-matrix.md	fpt ghec	fpt ghec

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

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[Copilot]

Pull request overview

Fixes a spelling typo in the Copilot feature matrix reference content so the “Features by IDE/version” intro sentences render correctly and read professionally.

Changes:

• Corrected 6 instances of “vesions” → “versions” in the feature-matrix intro sentences across multiple IDE sections.

[wyatttate545-cloud]

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