crypto/ssh: minor comment change (trivial)

Fixed a function comment.

Change-Id: I1185c0c849abbb8244c6282fa6036fa6939c3309
Reviewed-on: https://go-review.googlesource.com/23971
Reviewed-by: Han-Wen Nienhuys <hanwen@google.com>
Run-TryBot: Han-Wen Nienhuys <hanwen@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
1 file changed