Incorrect comments for StopTimes:AvailabilityType enum

[trevh3]

The comments in the StopTimes message, AvailabilityType enum look like they refer to a different enum

enum AvailabilityType {
    // Tram, Streetcar, Light rail. Any light rail or street level system within a metropolitan area.
    REGULAR = 0;

    // Subway, Metro. Any underground rail system within a metropolitan area.
    NOT_AVAILABLE = 1;

    // Rail. Used for intercity or long-distance travel.
    PHONE = 2;

    // Bus. Used for short- and long-distance bus routes.
    DRIVER = 3;
  }