Fixed #16233 -- Added link to multiple databases docs from custom sql alias section. Thanks charlax for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17872 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/topics/db/sql.txt

@@ -229,8 +229,8 @@ is required. For example::
 
         return row
 
-If you are using more than one database you can use
-``django.db.connections`` to obtain the connection (and cursor) for a
+If you are using :doc:`more than one database </topics/db/multi-db>`, you can
+use ``django.db.connections`` to obtain the connection (and cursor) for a
 specific database. ``django.db.connections`` is a dictionary-like
 object that allows you to retrieve a specific connection using its
 alias::