docs: Fix long standing linking antipattern.

Before we learned about :doc:, we used :ref: and put a dummy link at the
top of each page. Don't do that anymore.

This fixes PR14891 as a special case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172162 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/design_and_overview.rst b/docs/design_and_overview.rst
index 4b1d627..2fc377f 100644
--- a/docs/design_and_overview.rst
+++ b/docs/design_and_overview.rst
@@ -1,5 +1,3 @@
-.. _design_and_overview:
-
 LLVM Design & Overview
 ======================
 
@@ -31,7 +29,7 @@
 
   More details (quite old now).
 
-* :ref:`gep`
+* :doc:`GetElementPtr`
 
   Answers to some very frequent questions about LLVM's most frequently
   misunderstood instruction.