Merge pull request #4053 from Joshua-Anderson/link-fix

docs(concepts): remove unlinked 'the'

Author: mboersma

docs/understanding_deis/concepts.rst

@@ -103,7 +103,7 @@ See Also
 * :ref:`Architecture`
 * :ref:`Using Deis <using_deis>`
 * :ref:`Managing Deis <managing_deis>`
-* The `Twelve-Factor App`_
+* `Twelve-Factor App`_
 
 
 .. _`Twelve-Factor App`: http://12factor.net/