PYTHON-3606 - Document best practice for closing MongoClients and cursors #2680

Job	Run time
Make SDist	40s
Build wheels for manylinux_ppc64le	11m 8s
Build wheels for manylinux_s390x	11m 30s
Build wheels for manylinux_aarch64	11m 35s
Build wheels for win_amd6	4m 7s
Build wheels for manylinux_x86_64	2m 30s
Build wheels for macos	3m 26s
Build wheels for win32	6m 19s
Build wheels for manylinux_i686	2m 36s
Download Wheels	9s
	54m 0s

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