WP Notes Remover is a FREE WordPress plugin which removes the technical info such as "You May Use These HTML tags and attributes" below the comments.
Therefore no theme hacks are necessary.

How to use it ? Just install the plugin and you are good to go.

Download:

http://wordpress.org/extend/plugins/wp-notes-remover/

Do you use test/staging sites? Visit qSandbox for more info.
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