Wrong south setting in the docs

Should be `SOUTH_MIGRATION_MODULES`, see:
http://south.readthedocs.org/en/latest/settings.html#south-migration-modules

docs/getting_started.txt

@@ -16,7 +16,7 @@ Run `./manage.py syncdb` or `./manage.py migrate` if using migrations.
     If you are using South you'll have to add the following setting, since
     If you are using South you'll have to add the following setting, since
     taggit uses Django migrations by default::
     taggit uses Django migrations by default::
 
 
-      SOUTH_MIGRATIONS_MODULES = {
+      SOUTH_MIGRATION_MODULES = {
           'taggit': 'taggit.south_migrations',
           'taggit': 'taggit.south_migrations',
       }
       }