Update release documentation with `v3` instructions #4373

Job	Run time
Split workflow (ubuntu-latest, latest)	1m 48s
Split workflow (macos-latest, latest)	3m 24s
Split workflow (ubuntu-latest, default)	1m 41s
Split workflow (macos-latest, default)	2m 55s
Split workflow (ubuntu-latest, nightly-latest)	2m 10s
Split workflow (macos-latest, nightly-latest)	4m 19s
	16m 17s

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