Move header so that it can be picked up by other .rst files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161478 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CodeGenerator.rst b/docs/CodeGenerator.rst
index df04f5c..d1d0231 100644
--- a/docs/CodeGenerator.rst
+++ b/docs/CodeGenerator.rst
@@ -1,5 +1,9 @@
 .. _code_generator:
 
+==========================================
+The LLVM Target-Independent Code Generator
+==========================================
+
 .. role:: raw-html(raw)
    :format: html
 
@@ -15,10 +19,6 @@
     .yes:before { content: "Y" }
   </style>
 
-==========================================
-The LLVM Target-Independent Code Generator
-==========================================
-
 .. contents::
    :local: