[tz] Some typo fixes

[Paul Eggert]

On 3/19/22 01:13, Sascha Wildner via tz wrote:

> please consider the attached patch which fixes three of typos in the tz
> files.

Thanks, I installed that.

This inspired me to check spelling too, a bit of a challenge given all 
the proper names and foreign words. I found some other issues, fixed in 
the attached proposed patch.
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