runtime(help): Add Vim lang annotation support for codeblocks

closes: #16215

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/helphelp.txt b/runtime/doc/helphelp.txt
index 3da38ec..948ef72 100644
--- a/runtime/doc/helphelp.txt
+++ b/runtime/doc/helphelp.txt
@@ -1,4 +1,4 @@
-*helphelp.txt*	For Vim version 9.1.  Last change: 2024 Nov 19
+*helphelp.txt*	For Vim version 9.1.  Last change: 2024 Dec 15
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -437,7 +437,13 @@
 	echo "Example"
     endfunction
 <
-
+It's possible to add Vim syntax highlighting support to code examples.  This
+can be done by adding "vim" after the greater than (>) character (">vim").
+E.g: >vim
+    function Example_Func()
+	echo "Example"
+    endfunction
+<
 The following are highlighted differently in a Vim help file:
   - a special key name expressed either in <> notation as in <PageDown>, or
     as a Ctrl character as in CTRL-X