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/fortran.vim b/runtime/ftplugin/fortran.vim
index 3c32581..19a4c1e 100644
--- a/runtime/ftplugin/fortran.vim
+++ b/runtime/ftplugin/fortran.vim
@@ -11,6 +11,7 @@
 "  Doug Kearns, and Fritz Reese.
 " Last Change:	2023 Dec 22
 "		2024 Jan 14 by Vim Project (browsefilter)
+"		2024 May 23 by Riley Bruins <ribru17@gmail.com> ('commentstring')
 
 " Only do these settings when not done yet for this buffer
 if exists("b:did_ftplugin")
@@ -89,7 +90,7 @@
 endif
 
 " Set commentstring for foldmethod=marker
-setlocal cms=!%s
+setlocal cms=!\ %s
 
 " Tabs are not a good idea in Fortran so the default is to expand tabs
 if !exists("fortran_have_tabs")