[tz] Fixed typos

[Paul Eggert]

Ice Karma (J. Connell) 「氷宿縁」 wrote:
> I suspect "meterological" in the first diff hunk should actually read
> "meteorological", rather than "metrological".

Thanks, good catch. I revisited the source, found two more typos and fixed them 
too, all in the attached patch.
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