Update generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent.md

[cinnamondev]

Rephrases the step so that it is clear that is only possible to execute the command within an elevated PowerShell window.

Why:

Closes: #29847

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

Step 1 is rephrased so it is clear that the commands are only executable in PowerShell ("In a new admin elevated PowerShell window, ensure...")

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

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Source	Preview	Production	What Changed
authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent.md	fpt ghec ghes@ 3.10 3.9 3.8 3.7 3.6 ghae	fpt ghec ghes@ 3.10 3.9 3.8 3.7 3.6 ghae

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

[cmwilson21]

@cinnamondev Thank you for opening a PR and linking it to your issue! ✨

I'll get this triaged for review! ⚡

[guntrip]

Thanks for opening this, @cinnamondev! ✨ Your changes look great and we'll get this merged in the new year.

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Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours. If you're looking for your next contribution, check out our help wanted issues ⚡