runtime(doc): Improve :help synconcealed() description

closes: #18698

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: dkearns

runtime/doc/builtin.txt

@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2025 Oct 26
+*builtin.txt*	For Vim version 9.1.  Last change: 2025 Nov 08
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -11578,7 +11578,7 @@ synIDtrans({synID})					*synIDtrans()*
 
 
 synconcealed({lnum}, {col})				*synconcealed()*
-		The result is a |List| with currently three items:
+		The result is a |List| with three items:
 		1. The first item in the list is 0 if the character at the
 		   position {lnum} and {col} is not part of a concealable
 		   region, 1 if it is.  {lnum} is used like with |getline()|.