Update error-permission-denied-publickey.md

[m4ss1m0g]

I get a permission denied and I found a solution thanks to this Stackoverflow. It would be great if someone can point me to the right config for use custom key name.

Why:

Closes [#19000 ]

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Source	Preview	Production	What Changed
authentication/troubleshooting-ssh/error-permission-denied-publickey.md	fpt ghec ghes@ 3.5 3.4 3.3 3.2 ghae	fpt ghec ghes@ 3.5 3.4 3.3 3.2 ghae

[cmwilson21]

@m4ss1m0g Thanks so much for opening an issue and linking to this PR! ✨ I'll get this triaged for review :zap:

[vgrl]

Thanks for your contribution! I've chatted with the team about your PR and I see that we already mention this content in step 3 of "Checking for existing SSH keys". Given that, and since it's an specific situation is one that most users won't find themselves in, we won't be making the suggested change. Because of this, I'm closing the PR.

Thanks again for your work and your interest in improving GitHub's documentation!