runtime(kconfig): updated ftplugin and syntax script

Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/doc/syntax.txt

@@ -1,4 +1,4 @@
-*syntax.txt*	For Vim version 9.1.  Last change: 2025 Jan 11
+*syntax.txt*	For Vim version 9.1.  Last change: 2025 Jan 20
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2218,6 +2218,16 @@ To disable numbers having their own color add the following to your vimrc: >
 If you want quotes to have different highlighting than strings >
 	let g:jq_quote_highlight = 1
 
+KCONFIG							*ft-kconfig-syntax*
+
+Kconfig syntax highlighting language.  For syntax syncing, you can configure
+the following variable (default: 50): >
+
+	let kconfig_minlines = 50
+
+To configure a bit more (heavier) highlighting, set the following variable: >
+
+	let kconfig_syntax_heavy = 1
 
 LACE						*lace.vim* *ft-lace-syntax*
 

runtime/ftplugin/kconfig.vim

@@ -2,7 +2,7 @@
 " Vim syntax file
 " Maintainer:		Christian Brabandt <cb@256bit.org>
 " Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
-" Latest Revision:	2024-04-12
+" Latest Revision:	2025 Jan 20
 " License:		Vim (see :h license)
 " Repository:		https://github.com/chrisbra/vim-kconfig
 
@@ -19,4 +19,5 @@ setlocal comments=:# commentstring=#\ %s formatoptions-=t formatoptions+=croql
 " For matchit.vim
 if exists("loaded_matchit")
   let b:match_words = '^\<menu\>:\<endmenu\>,^\<if\>:\<endif\>,^\<choice\>:\<endchoice\>'
+  let b:undo_ftplugin .= "| unlet! b:match_words"
 endif