docs: Convert ProgrammersManual to reST.

Patch by Alexander Zinenko!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169208 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/programming.rst b/docs/programming.rst
index c4eec59..3fea6ed 100644
--- a/docs/programming.rst
+++ b/docs/programming.rst
@@ -12,6 +12,7 @@
    CompilerWriterInfo
    ExtendingLLVM
    HowToSetUpLLVMStyleRTTI
+   ProgrammersManual
 
 * `LLVM Language Reference Manual <LangRef.html>`_
 
@@ -22,7 +23,7 @@
 
   Information about LLVM's concurrency model.
 
-* `The LLVM Programmers Manual <ProgrammersManual.html>`_
+* :doc:`ProgrammersManual`
 
   Introduction to the general layout of the LLVM sourcebase, important classes
   and APIs, and some tips & tricks.