Multiple Unique Deployment Keys on One Server.

[tarrenj]

What article on docs.github.com is affected?

https://docs.github.com/en/free-pro-team@latest/developers/overview/managing-deploy-keys

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

Please consider adding instructions on configuring a unique ssh key per host alias via the ssh config file.

Additional information

I'll be submitting a PR for this momentarily.

[welcome]

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