merge revision(s) 06919949a60b42a8f30e8bd0cb075e17b05eebcd, 51bc992822f9108ad64de32d300e1cefd0e2da59, 42daa6c2a2b49b4e45f40736e25c7d182860f24a: [Backport #21141]
[Bug #21141] [DOC] Clarify what time is in UTC [Bug #21141] [DOC] Refine description of `Time#utc?` [Bug #21141] [DOC] Fix indentation
merge revision(s) 06919949a60b42a8f30e8bd0cb075e17b05eebcd, 51bc992822f9108ad64de32d300e1cefd0e2da59, 42daa6c2a2b49b4e45f40736e25c7d182860f24a: [Backport #21141]