[tz] [PROPOSED] Remove some invented abbreviations in ‘europe’

[Paul Eggert]

Tim Parenti wrote:
> These cases have been sufficiently rare that I think it's worth documenting them
> as we go, so they're easier to find once we feel '%z' is sufficiently
> well-supported we can rip them out.

Thanks. A downside of these detailed comments is that we'll have to maintain the 
comments, along with the data, if the data changes before we start assuming %z. 
So how about if we instead use simpler comments that don't contain detail that 
we'd have to maintain? That should be good enough to document the situation. 
Something like the attached, say.
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