runtime(doc): change "VIsual mode" to "Visual mode" in :h SafeState (#13901)

"Visual mode" is used everywhere else in the help when not referring to
something in the source code.

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 0ace7b1..1641361 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -1,4 +1,4 @@
-*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Jan 14
+*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Jan 23
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1098,7 +1098,7 @@
 				- Command line completion is active
 				You can use `mode()` to find out what state
 				Vim is in.  That may be:
-				- VIsual mode
+				- Visual mode
 				- Normal mode
 				- Insert mode
 				- Command-line mode