runtime(abap): set 'comments' and 'commentstring' option in ftplugin

Reference:
https://en.wikipedia.org/wiki/ABAP#Comments

closes: #17489

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/abap.vim b/runtime/ftplugin/abap.vim
index 8b2040e..fd6b841 100644
--- a/runtime/ftplugin/abap.vim
+++ b/runtime/ftplugin/abap.vim
@@ -5,6 +5,7 @@
 " License:	You may redistribute this under the same terms as Vim itself
 " Last Change:	2023 Aug 28 by Vim Project (undo_ftplugin)
 "               2024 Jan 14 by Vim Project (browsefilter)
+"               2025 Jun 08 by Riley Bruins <ribru17@gmail.com> ('comments', 'commentstring')
 " --------------------------------------------------------------------------
 
 " Only do this when not done yet for this buffer
@@ -18,8 +19,10 @@
 
 setlocal softtabstop=2 shiftwidth=2
 setlocal suffixesadd=.abap
+setlocal commentstring=\"\ %s
+setlocal comments=:\",:*
 
-let b:undo_ftplugin = "setl sts< sua< sw<"
+let b:undo_ftplugin = "setl sts< sua< sw< com< cms<"
 
 " Windows allows you to filter the open file dialog
 if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")