docs: Sphinxify TestingGuide

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167979 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/userguides.rst b/docs/userguides.rst
index 8c1554d..8f18420 100644
--- a/docs/userguides.rst
+++ b/docs/userguides.rst
@@ -20,6 +20,7 @@
    HowToSubmitABug
    SphinxQuickstartTemplate
    Phabricator
+   TestingGuide
 
 * :ref:`getting_started`
     
@@ -77,7 +78,7 @@
   A template + tutorial for writing new Sphinx documentation. It is meant
   to be read in source form.
     
-* `LLVM Testing Infrastructure Guide <TestingGuide.html>`_
+* :doc:`LLVM Testing Infrastructure Guide <TestingGuide>`
 
    A reference manual for using the LLVM testing infrastructure.