LRDOCS-1363 Asset-enabled Guestbooks, updated GuestbookLocalServiceImpl.updateGuestbook to take a userId parameter for consistency's sake; updated addEntry, updateEntry, addGuestbook, and updateGuestbook so that they actually populate the userId field
LRDOCS-1363 Updated code snippets with userId parameter that had been missing
LRDOCS-1363 More fixes to learning path text required by fixing the service layer so that it handles the userId parameter that had been missing