Update alias setup language to clarify usage

[moriartyb]

Why:

Current language makes it seem like you should add the lines provided into your config file rather than run the command once to append the generated alias to your profile for you.

Updated the language to make it clear you should run the command rather than append it.

Users who append by mistake will see things working but would add ~1sec to their powershell launch time, and would end up appending duplicate lines to their config file every time they launch their shell.

Closes:

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

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Content directory changes

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Source	Preview	Production	What Changed
copilot/github-copilot-in-the-cli/using-github-copilot-in-the-cli.md	fpt ghec	fpt ghec

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

[nguyenalex836]

@moriartyb Thanks so much for opening a PR! I'll get this triaged for review ✨

[subatoi]

Thank you for spotting this, and raising this fix!

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