Sphixify the GEP FAQ.

llvm-svn: 158858
diff --git a/llvm/docs/design_and_overview.rst b/llvm/docs/design_and_overview.rst
index c272fbf..ea68415 100644
--- a/llvm/docs/design_and_overview.rst
+++ b/llvm/docs/design_and_overview.rst
@@ -3,6 +3,11 @@
 LLVM Design & Overview
 ======================
 
+.. toctree::
+   :hidden:
+
+   GetElementPtr
+
 * `LLVM Language Reference Manual <LangRef.html>`_
 
   Defines the LLVM intermediate representation.
@@ -25,7 +30,7 @@
 
   More details (quite old now).
 
-* `GetElementPtr FAQ <GetElementPtr.html>`_
+* :ref:`gep`
 
   Answers to some very frequent questions about LLVM's most frequently
   misunderstood instruction.