updated for version 7.3.423
Problem:    Small mistakes in comments, proto and indent.
Solution:   Fix the mistakes.

Also update runtime files
diff --git a/runtime/syntax/nroff.vim b/runtime/syntax/nroff.vim
index 6f2a131..280ba9e 100644
--- a/runtime/syntax/nroff.vim
+++ b/runtime/syntax/nroff.vim
@@ -1,8 +1,8 @@
 " VIM syntax file
 " Language:	nroff/groff
-" Maintainer:	Alejandro López-Valencia <dradul@yahoo.com>
-" URL:		http://dradul.tripod.com/vim
-" Last Change:	2006 Apr 14
+" Maintainer:	Pedro Alejandro López-Valencia <palopezv@gmail.com>
+" URL:		http://vorbote.wordpress.com/
+" Last Change:	2012 Feb 2
 "
 " {{{1 Acknowledgements
 "
@@ -31,6 +31,9 @@
 	finish
 endif
 
+let s:cpo_save = &cpo
+set cpo&vim
+
 "
 " {{{1 plugin settings...
 "
@@ -256,4 +259,6 @@
 
 let b:current_syntax = "nroff"
 
+let &cpo = s:cpo_save
+unlet s:cpo_save
 " vim600: set fdm=marker fdl=2: