[tz] Recommendations to governments about time zone update notice period and format

[Paul Eggert]

On 2023-03-08 07:27, Brian Inglis via tz wrote:
> Prefix "official" before "release"

I've long resisted this sort of language for tzdb. Although the IANA 
publishes tzdb, tzdb is by no means authoritative and I am no officer. 
Calling releases "official" would just put another bullseye on my back.