Fix typos

Fixes typos in docstring.

Change-Id: I06ff5ae61c8a8128ec6a2106c609611ed4e6bd84

keystone/assignment/core.py

@@ -1647,7 +1647,7 @@ class RoleDriverV9(RoleDriverBase):
 
     @abc.abstractmethod
     def get_implied_role(self, prior_role_id, implied_role_id):
-        """Fetche a role inference rule.
+        """Get a role inference rule.
 
         :raises keystone.exception.ImpliedRoleNotFound: If the implied role
             doesn't exist.

keystone/common/wsgi.py

@@ -153,7 +153,9 @@ class BaseApplication(object):
         return cls(**local_config)
 
     def __call__(self, environ, start_response):
-        r"""Provide subclasses how to implement __call__, probably like this.
+        r"""Provide subclasses on how to implement __call__.
+
+        Probably like this:
 
         @webob.dec.wsgify()
         def __call__(self, req):