ssh: document how to unmarshal public keys
Fixes golang/go#21491.
Run-TryBot: Han-Wen Nienhuys
TryBot-Result: Gobot Gobot
@@ -276,7 +276,8 @@ type PublicKey interface {
Type() string
// Marshal returns the serialized key data in SSH wire format,
- // with the name prefix.
+ // with the name prefix. To unmarshal the returned data, use
+ // the ParsePublicKey function.
Marshal() []byte
// Verify that sig is a signature on the given data using this
