PYTHON-4938 Clarify write concern rules in the transactions spec #1991

Job	Run time
Build wheels for manylinux_x86_64	2m 21s
Build wheels for manylinux_aarch64	11m 27s
Make SDist	34s
Build wheels for manylinux_ppc64le	11m 9s
Build wheels for manylinux_s390x	11m 36s
Build wheels for manylinux_i686	2m 21s
Build wheels for win_amd6	4m 20s
Build wheels for win32	4m 8s
Build wheels for macos	3m 26s
Download Wheels	6s
	51m 28s

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