Fixed a typo in disabling-github-copilot-free.md

[Spyder-0]

"Show Copilot" was missing quotations.

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

Changed "Show Copilot to "Show Copilot".

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• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Source	Review	Production	What Changed
copilot/managing-copilot/managing-copilot-as-an-individual-subscriber/managing-copilot-free/disabling-github-copilot-free.md	fpt ghec	fpt ghec

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

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[Sharra-writes]

Thanks so much for opening a PR with this fix! I'll update the branch and get this merged once tests are passing 🍏

[Spyder-0]

No problem, glad I could help.

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