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/src/testdir/test_vim9_cmd.vim b/src/testdir/test_vim9_cmd.vim
index 5407662..d38e1c8 100644
--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -159,7 +159,7 @@
   v9.CheckScriptSuccess(lines)
   delfunc g:TheFunc
 
-  # vim9cmd execute(cmd) executes code in vim9 script context
+  # vim9cmd execute(cmd) executes code in Vim9 script context
   lines =<< trim END
     vim9cmd execute("g:vim9executetest = 'bar'")
     call assert_equal('bar', g:vim9executetest)
@@ -176,7 +176,7 @@
   unlet g:vim9executetest1
   unlet g:vim9executetest2
 
-  # legacy call execute(cmd) executes code in vim script context
+  # legacy call execute(cmd) executes code in Vim script context
   lines =<< trim END
     vim9script
     legacy call execute("let g:vim9executetest = 'bar'")