update linking

change to linking

Author: Jibola

doc/tools.rst

@@ -72,8 +72,8 @@ Django MongoDB Backend
   database backend library specifically made for Django. The integration takes
   advantage of MongoDB's unique document model capabilities, which align
   naturally with Django's philosophy of simplified data modeling and
-  reduced development complexity. The source is
-  `available on GitHub <https://github.com/mongodb-labs/django-mongodb-backend>`_.
+  reduced development complexity. The source is available
+  `on GitHub <https://github.com/mongodb-labs/django-mongodb-backend>`_.
 
 No longer maintained
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