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/testdir/input/vim9_expr.vim b/runtime/syntax/testdir/input/vim9_expr.vim
index fc94abd..592acad 100644
--- a/runtime/syntax/testdir/input/vim9_expr.vim
+++ b/runtime/syntax/testdir/input/vim9_expr.vim
@@ -149,7 +149,7 @@
 enddef
 
 
-# Issue #16227 (Vimscript ternary expression highlighting)
+# Issue #16227 (Vim script ternary expression highlighting)
 
 var foo = 'foo'                         # comment
 var bar = foo == 'foo' ? 'bar' : 'baz'