patch 9.1.0464: no whitespace padding in commentstring option in ftplugins

Problem:  no whitespace padding in commentstring option in ftplugins
Solution: Change default to include whitespace padding, update
          existing filetype plugins with the new default value
          (Riley Bruins)

closes: #14843

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/nroff.vim b/runtime/ftplugin/nroff.vim
index cf62d02..ed0b32f 100644
--- a/runtime/ftplugin/nroff.vim
+++ b/runtime/ftplugin/nroff.vim
@@ -2,15 +2,15 @@
 " Language:	roff(7)
 " Maintainer:	Aman Verma
 " Homepage:	https://github.com/a-vrma/vim-nroff-ftplugin
-" Previous Maintainer:	Chris Spiegel <cspiegel@gmail.com>
-" Last Change:	2020 Nov 21
+" Previous Maintainer: Chris Spiegel <cspiegel@gmail.com>
+"		2024 May 24 by Riley Bruins <ribru17@gmail.com> ('commentstring')
 
 if exists("b:did_ftplugin")
   finish
 endif
 let b:did_ftplugin = 1
 
-setlocal commentstring=.\\\"%s
+setlocal commentstring=.\\\"\ %s
 setlocal comments=:.\\\"
 setlocal sections+=Sh