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/qml.vim b/runtime/ftplugin/qml.vim
index aa05c11..53df11c 100644
--- a/runtime/ftplugin/qml.vim
+++ b/runtime/ftplugin/qml.vim
@@ -3,6 +3,7 @@
 " Maintainer: Chase Knowlden <haroldknowlden@gmail.com>
 " Last Change: 2023 Aug 16
 " 	       2023 Aug 23 by Vim Project (browsefilter)
+" 	       2024 May 23 by Riley Bruins <ribru17@gmail.com> ('commentstring')
 
 if exists( 'b:did_ftplugin' )
    finish
@@ -28,7 +29,7 @@
 
 " Set 'comments' to format dashed lists in comments.
 setlocal comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,://
-setlocal commentstring=//%s
+setlocal commentstring=//\ %s
 
 setlocal formatoptions-=t
 setlocal formatoptions+=croql