PYTHON-5111 Update datetime_conversion in docstrings of MongoClients #1631

Job	Run time
Build wheels for manylinux_x86_64	2m 21s
Make SDist	38s
Build wheels for manylinux_aarch64	11m 21s
Build wheels for manylinux_ppc64le	10m 40s
Build wheels for manylinux_s390x	11m 24s
Build wheels for manylinux_i686	2m 31s
Build wheels for win_amd6	4m 45s
Build wheels for win32	4m 46s
Build wheels for macos	4m 6s
Download Wheels	5s
	52m 37s

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