Merge pull request #422 from tdmackey/flask-link

Fix Flask CloudSQL link

Author: waprin

appengine/flexible/hello_world_django/README.md

@@ -47,7 +47,7 @@ For production applications running on Google Cloud Platform, you have
 the following options:
 
 * Use [Cloud SQL](https://cloud.google.com/sql), a fully-managed MySQL database.
-  There is a [Flask CloudSQL](../clousql) sample that should be straightfoward
+  There is a [Flask CloudSQL](../cloudsql) sample that should be straightfoward
   to adapt to Django.
 * Use any database of your choice hosted on
   [Google Compute Engine](https://cloud.google.com/compute). The