chore: update url for apidoc

[lazysoundsystem]

Refs: RW-809

This shouldn't be merged before the domain is switched...

I was going to change this to .org as in the ticket, but as reliefweb.org re-directs to reliefweb.int, thought better to use the latter.

Note too a few mentions of the current, soon-to-be old address on https://reliefweb.int/help/api

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