Update BiblioDB to correct HTML5 reference

Hey Robin,

Can you help us update the ReSpec BiblioDB to the correct listing for HTML5 now that it has been published as CR? Also, I don't believe David Hyatt ever edited. :)

[HTML5]
Ian Hickson; David Hyatt. HTML5.<http://www.w3.org/TR/html5> 29 March 2012. W3C Working Draft. (Work in progress.) URL: http://www.w3.org/TR/html5

Thanks!

-Jacob