docs: Remove duplicate ssh-keygen command in Github AE documentation

[valxntine]

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/github-ae@latest/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent

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

Step 2 of Generated a new SSH key currently shows the user needs to run two of the same commands to generate a new key. The code block in step 2 should just contain one command, removing the duplicate.

Additional information

[welcome]

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[cmwilson21]

@valxntine Thank you for opening an issue and linking it to your PR! ✨