Fixed comment typos.

django/db/models/sql/query.py

@@ -1232,7 +1232,7 @@ class Query(object):
                 q_object.clone(), q_object.negated)
         # For join promotion this case is doing an AND for the added q_object
         # and existing conditions. So, any existing inner join forces the join
-        # type to remain inner. Exsting outer joins can however be demoted.
+        # type to remain inner. Existing outer joins can however be demoted.
         # (Consider case where rel_a is LOUTER and rel_a__col=1 is added - if
         # rel_a doesn't produce any rows, then the whole condition must fail.
         # So, demotion is OK.
@@ -1279,7 +1279,7 @@ class Query(object):
         single name in 'names' can generate multiple PathInfos (m2m for
         example).
 
-        'names' is the path of names to travle, 'opts' is the model Options we
+        'names' is the path of names to travel, 'opts' is the model Options we
         start the name resolving from, 'allow_many' is as for setup_joins().
 
         Returns a list of PathInfo tuples. In addition returns the final field