I've added a note about duplicates to that doc. Re: adding the adp, perhaps a better fix would be to add a link "show pages where this is used" which then searches the source code, finds usage of the message key, guesses the URL for those pages, and displays them (or their source). It would work for all keys without additional developer work per key. It wouldn't help navigating to pages that have required inputs, but neither does putting the adp path in the description.
