Heh, looks like Bungie has filed a trademark for the term "ViDoc", under the definition of "Audio and video recordings featuring previews and other information about video games". You may recall Urk's full explanation for the term from a Bungie Weekly Update back in 2009:
ViDoc is actually an amalgamation of three terms: visual, informational, and documentation. It’s definitely not an industry term that we would expect you to be familiar with. In fact, we kinda made it up.