runtime(doc): clarify single/multibyte support for 'fillchars'

closes: #17287

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index f3824cd..5563a05 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2025 May 08
+*options.txt*	For Vim version 9.1.  Last change: 2025 May 10
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -3663,9 +3663,8 @@
 	Example: >
 	    :set fillchars=stl:\ ,stlnc:\ ,vert:\|,fold:-,diff:-
 <
-	For the "stl", "stlnc", "foldopen", "foldclose" and "foldsep" items
-	single-byte and multibyte characters are supported.  But double-width
-	characters are not supported. |E1512|
+	All items support single-byte and multibyte characters.  But
+	double-width characters are not supported. |E1512|
 
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