In Final Notes, link directly to Alternate Theano Types section

doc/extending/other_ops.txt

@@ -243,6 +243,8 @@ Want C speed without writing C code for your new Op? You can use Numba
 to generate the C code for you! Here is an `example
 Op <https://gist.github.com/nouiz/5492778#file-theano_op-py>`_ doing that.
 
+.. _alternate_theano_types:
+
 Alternate Theano Types
 ======================
 

doc/tutorial/extending_theano_c.txt

@@ -959,4 +959,4 @@ Final Note
 
 This tutorial focuses on providing C implementations to ops that manipulate
 Theano tensors. For more information about other Theano types, you can refer
-to the section :ref:`Other ops <other_ops>`.
+to the section :ref:`Alternate Theano Types <alternate_theano_types>`.