fix lint

Author: MrYamous

messenger.rst

@@ -839,7 +839,7 @@ the configuration:
                 ]);
         };
 
-.. caution::
+.. warning::
 
     ``x-max-priority`` cannot be changed on an existing RabbitMQ queue.
     Messenger will fail to auto-setup, and priorities won't work. Create a new

reference/configuration/security.rst

@@ -78,7 +78,7 @@ The possible values of this option are:
   other session attributes are lost.
 
 erase_credentials
-------------------
+-----------------
 
 **type**: ``boolean`` **default**: ``true``