[tz] tzdb timezone names/identifiers and links (was: Add new timezone for Hanoi Capital, Vietnam)

[Paul Eggert]

On 2/19/19 2:31 PM, Tim Parenti wrote:
> So, since it's pretty clear that the "There should typically be at 
> least one name for each ISO 3166-1 officially assigned two-letter code 
> for an inhabited country or territory" guideline has been, if not 
> abandoned entirely, at least significantly de-prioritized, perhaps 
> theory.html needs an update indicating that, yes, this /used/ to be 
> considered more important, but is not any longer (perhaps going a bit 
> into the rationale), and that we don't intend to create new zones 
> anymore if that's the only justification.

Sounds good to me; proposed patch attached.

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