[Tagging] Feature Proposal - RFC - Deprecate departures_board=realtime

[Dimitar]

> Both wiki pages wre created at the same time... looks to me like passenger_information_display should be depreciated as it has less use than departures_board.  (~73,000 compared to ~190,000)

Please read the proposal. It deprecates only departures_board=realtime
in favour of passenger_information_display =yes. All other values for
departures_board remain as they are.

passenger_information_display - 73 769 uses
departures_board=realtime - 14 772 uses