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/racket.vim b/runtime/ftplugin/racket.vim
index 84f5422..7bfd87d 100644
--- a/runtime/ftplugin/racket.vim
+++ b/runtime/ftplugin/racket.vim
@@ -3,8 +3,7 @@
 " Maintainer:           D. Ben Knoble <ben.knoble+github@gmail.com>
 " Previous Maintainer:  Will Langstroth <will@langstroth.com>
 " URL:                  https://github.com/benknoble/vim-racket
-" Last Change:          2022 Aug 29
-"                       2024 Jan 14 by Vim Project (browsefilter)
+" Last Change:          2024 May 28
 
 if exists("b:did_ftplugin")
   finish
@@ -21,7 +20,7 @@
 setlocal comments=:;;;;,:;;;,:;;,:;
 setlocal formatoptions+=r
 
-"setlocal commentstring=;;%s
+"setlocal commentstring=;;\ %s
 setlocal commentstring=#\|\ %s\ \|#
 
 setlocal formatprg=raco\ fmt