Backport commit 2999341 from Emacs master branch

Add .info extension to @setfilename commands in doc
29993416fb4d19c1c3bb146367fc4bed74845486
Glenn Morris
Mon Jun 9 22:20:31 2014 -0400

doc/org.texi

@@ -1,6 +1,6 @@
 \input texinfo  @c -*- coding: utf-8 -*-
 @c %**start of header
-@setfilename ../../info/org
+@setfilename ../../info/org.info
 @settitle The Org Manual
 
 @include org-version.inc