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/asm.vim b/runtime/ftplugin/asm.vim
index 0ae1610..4482b90 100644
--- a/runtime/ftplugin/asm.vim
+++ b/runtime/ftplugin/asm.vim
@@ -4,13 +4,14 @@
 " Last Change:	2020 May 23
 " 		2023 Aug 28 by Vim Project (undo_ftplugin)
 " 		2024 Apr 09 by Vim Project (add Matchit support)
+" 		2024 May 23 by Riley Bruins <ribru17@gmail.com> ('commentstring')
 
 if exists("b:did_ftplugin") | finish | endif
 let b:did_ftplugin = 1
 
 setl include=^\\s*%\\s*include
 setl comments=:;,s1:/*,mb:*,ex:*/,://
-setl commentstring=;%s
+setl commentstring=;\ %s
 
 let b:undo_ftplugin = "setl commentstring< comments< include<"