[tz] Yukon and the zone.tab file

The two Yukon entries in the zone.tab file still have descriptions with the name "Pacific": CA +6043-13503 America/Whitehorse *Pacific* - Yukon (east) CA +6404-13925 America/Dawson *Pacific* - Yukon (west) Please consider changing the descriptions to something like this: CA +6043-13503 America/Whitehorse *MST* - Yukon (east) CA +6404-13925 America/Dawson *MST* - Yukon (west) Thank you. -chris