Actually forget that idea for now...
Try this instead
Open the doco in Dreamweaver
Go to Command -> Clean up HTML
Check "Remove Non-Dreamweaver HTML Comments" and then click go
This should remove the comment tags. It may delete other ones as well so make sure you check if you have other comment tags that you need to remain and then just add them back in. I would recommend backing up your file before doing this.
http://livedocs.adobe.com/en_US/Dreamweaver/9.0/help.html?content=WSc78c5058ca073340dcda9110b1f693f21-7ba0.html