OffsetDateTime: Clarify why UTC is spelled UTC

[Maia-Everett]

You were to afraid to ask, but here's the explanation nonetheless. :)

[bowbahdoe]

Can you find a citation for that choice?

[tj-wazei]

Lovely work chappy

@bowbahdoe https://en.wikipedia.org/wiki/Coordinated_Universal_Time

• I didn't mean to approve the PR - had my maintainer hat on - It's Ethans project

[Maia-Everett]

Can you find a citation for that choice?

@tj-wazei has already linked to Wikipedia https://en.wikipedia.org/wiki/Coordinated_Universal_Time, and it cites as one of its sources, for example, https://www.nist.gov/pml/time-and-frequency-division/how-utcnist-related-coordinated-universal-time-utc-international#7114136

In 1970, the Coordinated Universal Time system was devised by an international advisory group of technical experts within the International Telecommunication Union (ITU). The ITU felt it was best to designate a single abbreviation for use in all languages in order to minimize confusion. For example, in English the abbreviation for coordinated universal time would be CUT, while in French the abbreviation for "temps universel coordonné" would be TUC. To avoid appearing to favor any particular language, the abbreviation UTC was selected.