Add drive-up spaces disclaimer text to Ferries sailing schedule

[waynedyck]

Text should be something along the lines of,

Vehicles in line for tollbooth are not included in drive-up spaces estimate

[waynedyck]

Maybe rather than adding this as a header, which would display on routes without the indicator, perhaps we add it as text at the bottom of the cell, below the indicator itself. We do something like this for providing more details with the Amtrak Cascades schedules.