Fixed #13099 - incorrect SQL for `exclude()` example

Thanks to istruble for the report.



git-svn-id: http://code.djangoproject.com/svn/django/trunk@12936 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/ref/models/querysets.txt

@@ -174,7 +174,7 @@ In SQL terms, that evaluates to::
 
     SELECT ...
     WHERE NOT pub_date > '2005-1-3'
-    OR NOT headline = 'Hello'
+    AND NOT headline = 'Hello'
 
 Note the second example is more restrictive.