Use latest shell commands for ssh-add key article

[madbernard]

Code of Conduct

• [X] 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/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?

The instructions for storing your ssh passphrase in Mac OS keychain silently fail for OS greater than 12, which I believe is most of us these days. Thus, when following the instructions Github gives you, you end up still entering your SSH password with command line git every interaction. The modern shell commands are described here: https://apple.stackexchange.com/questions/48502/how-can-i-permanently-add-my-ssh-private-key-to-keychain-so-it-is-automatically/250572#250572

Additional information

No response

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[cmwilson21]

@madbernard Thanks for creating this issue and linking it to your PR!

[github-actions[bot]]

A stale label has been added to this issue becuase it has been open for 60 days with no activity. To keep this issue open, add a comment within 3 days.

[madbernard]

bump