patch 9.1.1001: ComplMatchIns highlight hard to read on light background

Problem:  ComplMatchIns highlight hard to read on light background
          (after v9.1.0996)
Solution: define the highlighting group cleared, it should be configured in
          colorschemes separately (glepnir)

closes: #16414

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 489415c..780db60 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2024 Dec 28
+*options.txt*	For Vim version 9.1.  Last change: 2025 Jan 10
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -4348,7 +4348,7 @@
 				     #:TabLineSel,_:TabLineFill,!:CursorColumn,
 				     .:CursorLine,o:ColorColumn,q:QuickFixLine,
 				     z:StatusLineTerm,Z:StatusLineTermNC,
-				     g:MsgArea")
+				     g:MsgArea,h:ComplMatchIns")
 			global
 	This option can be used to set highlighting mode for various
 	occasions.  It is a comma-separated list of character pairs.  The
@@ -4368,6 +4368,7 @@
 	|hl-MoreMsg|	 m  |more-prompt|
 	|hl-ModeMsg|	 M  Mode (e.g., "-- INSERT --")
 	|hl-MsgArea|	 g  |Command-line| and message area
+	|hl-ComplMatchIns| h  matched text of currently inserted completion
 	|hl-LineNr|	 n  line number for ":number" and ":#" commands, and
 			    when 'number' or 'relativenumber' option is set.
 	|hl-LineNrAbove|   a  line number above the cursor for when the