docs: def __disclaimer(opt=""):
      """
      Print the disclaimers once. If they've already been shown, skip over.
  
      :return none:
      """
      global settings
      if opt is "update":
          print("Disclaimer: LiPD files may be updated and modified to adhere to standards\n")
          settings["note_update"] = False
      if opt is "validate":
          print("Note: Use lipd.validate() or www.LiPD.net/create "
                "to ensure that your new LiPD file(s) are valid")
          settings["note_validate"] = False
      return