[tz] Typo in zic(8) man page

[Paul Eggert]

On 10/7/21 12:52 PM, Jonathan Wakely via tz wrote:
> "giving of the amount of time to be added"
> 
> The first "of" looks like a typo.

Thanks for reporting that. Also, there's a stray "effect," in the next 
line. I installed the attached patch.
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