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/erlang.vim b/runtime/ftplugin/erlang.vim
index 1cb57f4..5a3ab71 100644
--- a/runtime/ftplugin/erlang.vim
+++ b/runtime/ftplugin/erlang.vim
@@ -6,7 +6,8 @@
 "               Eduardo Lopez (http://github.com/tapichu)
 "               Arvid Bjurklint (http://github.com/slarwise)
 "               Paweł Zacharek (http://github.com/subc2)
-" Last Update:  2023-Dec-20
+"               Riley Bruins (http://github.com/ribru17) ('commentstring')
+" Last Update:  2024 May 23
 " License:      Vim license
 " URL:          https://github.com/vim-erlang/vim-erlang-runtime
 
@@ -27,7 +28,7 @@
 endif
 
 setlocal comments=:%%%,:%%,:%
-setlocal commentstring=%%s
+setlocal commentstring=%\ %s
 
 setlocal formatoptions+=ro