PYTHON-4938 Clarify write concern rules in the transactions spec #1990

Job	Run time
Build wheels for manylinux_x86_64	2m 39s
Build wheels for manylinux_aarch64	11m 22s
Build wheels for manylinux_ppc64le	11m 7s
Make SDist	30s
Build wheels for manylinux_s390x	11m 20s
Build wheels for manylinux_i686	2m 21s
Build wheels for win_amd6	3m 54s
Build wheels for win32	5m 11s
Build wheels for macos	4m 25s
Download Wheels	8s
	52m 57s

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