runtime(doc): Fix notation of "Vim script" and "Vim9 script"

closes: #17213

Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index 2ee17a2..741ec81 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -1546,7 +1546,7 @@
 syn region	vimGlobal	matchgroup=Statement start='\<g\%[lobal]!\=/'  skip='\\.' end='/'	skipwhite nextgroup=vimSubst1
 syn region	vimGlobal	matchgroup=Statement start='\<v\%[global]!\=/' skip='\\.' end='/'	skipwhite nextgroup=vimSubst1
 
-" Vim9 Script Regions: {{{2
+" Vim9 script Regions: {{{2
 " ==================
 
 if s:vim9script