runtime(doc): revert modeline change in vim9.txt

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt
index 3addea8..bf50094 100644
--- a/runtime/doc/vim9.txt
+++ b/runtime/doc/vim9.txt
@@ -1,4 +1,4 @@
-*vim9.txt*	For Vim version 9.1.  Last change: 2025 Mar 05
+*vim9.txt*	For Vim version 9.1.  Last change: 2025 Mar 06
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2439,4 +2439,4 @@
 
 
 
- vim:tw=78:ts=8:noet:ft=help:norl:nofen:
+ vim:tw=78:ts=8:noet:ft=help:norl: