Brad Fitzpatrick f7cb6630e7 tailcfg: document SSHPrincipal.PubKeys URL expansions
From f74ee80abe8819f3d3bfd9138056a46820f4fc54 which lacked docs.

Updates #3802

Change-Id: Ia7df05a486ae383cc6d9aca9dfe487b04e243ad5
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2022-04-20 20:12:37 -07:00
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