Update how-jquery-works.md

On this the very first page, I think a little more hand-holding would be worth having.

Author: githubshrek

page/about-jquery/how-jquery-works.md

@@ -82,6 +82,7 @@ $( document ).ready(function() {
 
 });
 ```
+Try replacing your first snippet of jQuery code, which you put earlier in your HTML file, with the one above, save the HTML file again and reload to try this out.
 
 ### Complete Example