add html comment to vdcode code example

Example 1: html comment

<!--This is a comment in html.-->
<!--You can put comments enywhere! It does not care if it is mid peice of
code in a peice of code! You must put the ending arrows in or it will
think everything is a comment! Note you can comment over multiple lines.
Use a ! at the start arrow, this may not make sence as the rest of
html uses tags where ! is at the ends.-->

Example 2: hmtl comment

<!--
this is a multi-line comment and is the only way to comment in html
However you can put them on the same line
-->

Tags:

Css Example