[docs] Remove POD based man page docs (and build system support).
 - Currently this leaves us with less build system support (e.g., installing man pages) for the docs than is desired. I'm working on fixing this, but it may take a while. If someone finds this particularly egregious let me know and I will prioritize it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156389 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/Makefile b/docs/Makefile
index 51bfab6..122c4b8 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -8,7 +8,7 @@
 ##===----------------------------------------------------------------------===##
 
 LEVEL      := ..
-DIRS       := CommandGuide
+DIRS       :=
 
 ifdef BUILD_FOR_WEBSITE
 PROJ_OBJ_DIR = .