Sphinxify the MakefileGuide document.

llvm-svn: 158789
diff --git a/llvm/docs/development_process.rst b/llvm/docs/development_process.rst
index 5cb7181..40eb24d 100644
--- a/llvm/docs/development_process.rst
+++ b/llvm/docs/development_process.rst
@@ -6,8 +6,9 @@
 .. toctree::
    :hidden:
 
-   Projects
    CodingStandards
+   MakefileGuide
+   Projects
 
 \
 
@@ -29,7 +30,7 @@
    Describes the LLVMBuild organization and files used by LLVM to specify
    component descriptions.
 
- * `LLVM Makefile Guide <MakefileGuide.html>`_
+ * :ref:`makefile_guide`
 
    Describes how the LLVM makefiles work and how to use them.