emacs: keep info documentation

Closes Homebrew/homebrew#22924.

Formula/emacs.rb

@@ -6,6 +6,8 @@ class Emacs < Formula
   mirror 'http://ftp.gnu.org/pub/gnu/emacs/emacs-24.3.tar.gz'
   sha256 '0098ca3204813d69cd8412045ba33e8701fa2062f4bff56bedafc064979eef41'
 
+  skip_clean 'share/info' # Keep the docs
+
   option "cocoa", "Build a Cocoa version of emacs"
   option "srgb", "Enable sRGB colors in the Cocoa version of emacs"
   option "with-x", "Include X11 support"
@@ -22,6 +24,7 @@ class Emacs < Formula
     depends_on :autoconf
     depends_on :automake
   end
+
   depends_on 'pkg-config' => :build
   depends_on :x11 if build.include? "with-x"
   depends_on 'gnutls' => :optional
@@ -41,8 +44,7 @@ class Emacs < Formula
   end
 
   def install
-    # HEAD builds are currently blowing up when built in parallel
-    # as of April 20 2012
+    # HEAD builds blow up when built in parallel as of April 20 2012
     ENV.j1 if build.head?
 
     args = ["--prefix=#{prefix}",