all: fix some comments

Change-Id: I11030ee466c8cac6855ce4fe2cf72e0b8d7029f8
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/463796
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>

ssh/knownhosts/knownhosts.go

@@ -142,7 +142,7 @@ func keyEq(a, b ssh.PublicKey) bool {
 	return bytes.Equal(a.Marshal(), b.Marshal())
 }
 
-// IsAuthorityForHost can be used as a callback in ssh.CertChecker
+// IsHostAuthority can be used as a callback in ssh.CertChecker
 func (db *hostKeyDB) IsHostAuthority(remote ssh.PublicKey, address string) bool {
 	h, p, err := net.SplitHostPort(address)
 	if err != nil {