runtime(doc): clarify 'includeexpr' is not used for <cfile>

fixes: #17139

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 83032e1..8073457 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 Apr 18
+*options.txt*	For Vim version 9.1.  Last change: 2025 Apr 19
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -4845,7 +4845,7 @@
 <
 	Also used for the |gf| command if an unmodified file name can't be
 	found.  Allows doing "gf" on the name after an 'include' statement.
-	Also used for |<cfile>|.
+	Note: Not used for |<cfile>|.
 
 	If the expression starts with s: or |<SID>|, then it is replaced with
 	the script ID (|local-function|). Example: >