fix comment and space

manage.py

@@ -5,15 +5,16 @@
 def patch_create_suffix(original):
     """
     Patch mysql creation policy to handle the "utf8mb4" facility. This appears tricky but it's necessary
-    due to the conception of "extended utf-8" in mysql. If we do not patch, the mysql backend is not even run !
+    due to the conception of "extended utf-8" in mysql. If we do not patch, the mysql backend cannot index
+    ``VARCHAR(255)`` fields !
     see <http://bd808.com/blog/2017/04/17/making-django-migrations-that-work-with-mysql-55-and-utf8mb4/>
     for explanations
 
     :param original: the original function we are patching
     :return: the patched function
     """
     def patch(self):
-        return original(self) + 'ROW_FORMAT=DYNAMIC'
+        return original(self) + ' ROW_FORMAT=DYNAMIC'
     return patch