Fix incorrect variable reference in documentation

[brambhattabhishek]

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

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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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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on the review server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
copilot/quickstart.md	fpt ghec	fpt ghec

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

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[Sharra-writes]

@brambhattabhishek Thanks for taking the time to contribute to this project. For changes of this nature, we ask that you open an issue first so we can discuss the problem you're hoping to solve before starting work on an implementation. We also ask that you follow the pull request template when opening a pull request, to help clarify your intent. Please also take a look at our contributing docs for more info.

I'm going to close this now, but feel free to open an issue if you would like to discuss the problem you're trying to fix in greater detail.