I noticed it in the first picture as well and wasn't fussed. Just try using a bit of metho and a very sharp scraping blade and should come off easy. That's if its on the outside of the plastic.
Just be careful not to scratch the cover and don't use any harsher chemicals otherwise you might damage the plastic.
But really who cares is someone gonna look in your engine bay and go "Oh my god I can't believe there's a web address on your cover!"