runtime(help): Unset `'comments'` and `'cms'` options

Commit: 
https://github.com/vim/vim/commit/adfea9b4e68f39744fcb6ce7840e1c3c3b4637db
Author: Phạm Bình An <111893501+brianhus...@users.noreply.github.com>
Date:   Fri Aug 8 10:44:18 2025 +0200

    runtime(help): Unset `'comments'` and `'cms'` options
    
    Problem:  Vim's help file doesn't have any syntax for comments, but
              'comments' and 'commentstring' are still set in the help
              buffer.
    Solution: Unset 'comments' and 'cms' in help buffer
    
    closes: #17889
    
    Signed-off-by: Phạm Bình An <111893501+brianhus...@users.noreply.github.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/ftplugin/help.vim b/runtime/ftplugin/help.vim
index 0109c1752..e8651b5d5 100644
--- a/runtime/ftplugin/help.vim
+++ b/runtime/ftplugin/help.vim
@@ -3,6 +3,7 @@
 " Previous Maintainer:  Nikolai Weibull <n...@bitwi.se>
 " Last Change:          2025 Apr 08
 " 2025 Apr 08 by Vim project (set 'omnifunc' and 'iskeyword', #17073)
+" 2025 Aug 08 by Vim project (unset comment options, #17889)
 
 if exists("b:did_ftplugin")
   finish
@@ -12,7 +13,9 @@ let b:did_ftplugin = 1
 let s:cpo_save = &cpo
 set cpo&vim
 
-let b:undo_ftplugin = "setl isk< fo< tw< cole< cocu< keywordprg< omnifunc<"
+let b:undo_ftplugin = "setl isk< fo< tw< cole< cocu< keywordprg< omnifunc< 
comments< cms<"
+
+setl comments= cms=
 
 setlocal formatoptions+=tcroql textwidth=78 keywordprg=:help 
omnifunc=s:HelpComplete
 let &l:iskeyword='!-~,^*,^|,^",192-255'

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