cleanup, docs

site/doc/pages/cli_arg.txt

@@ -15,4 +15,5 @@ If the key is missing, or the resolved value is empty, `default_value` is return
 For commands that need multiple values or typed reads, prefer calling `cli_input(context)` once and reading the returned `DValue` directly.
 
 :example
-print("cli_arg example\n");
+String name = cli_arg(context, "name", "world");
+print("hello ", name, "\n");