do not mention the deprecated passphrase mode

borg/key.py

@@ -90,7 +90,7 @@ class PlaintextKey(KeyBase):
 
     @classmethod
     def create(cls, repository, args):
-        logger.info('Encryption NOT enabled.\nUse the "--encryption=repokey|keyfile|passphrase" to enable encryption.')
+        logger.info('Encryption NOT enabled.\nUse the "--encryption=repokey|keyfile" to enable encryption.')
         return cls(repository)
 
     @classmethod