Update use-ssh-keys-to-authenticate.md

[burtonrodman]

trafficstars

add -t rsa, as RSA is no longer the default protocol

[prmerger-automator[bot]]

@burtonrodman : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[Court72]

@vijayma

Can you review the proposed changes?

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[burtonrodman]

sorry, it would be more accurate to say rsa is not the default on Mac.

[steved0x]

Closing as this was fixed in another PR