Clarify short title of "Using custom instructions to unlock the power of Copilot code review"

[divigrape9]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/copilot/tutorials/use-custom-instructions

What part(s) of the article would you like to see updated?

I would like to see the short title of this article updated.

Additional information

Currently the short title of this tutorial is "Use custom instructions"; which doesn't indicate this tutorial is related to Code Review.

This is misleading when navigating through the tutorials from the side navigation:

[welcome]

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