PYTHON-3606 - Document best practice for closing MongoClients and cursors #7932

Job	Run time
Typing Tests (3.9)	1m 10s
Docs Checks	42s
static	3m 8s
CPython 3.9-ubuntu-latest	9m 5s
Typing Tests (3.11)	1m 9s
CPython pypy-3.10-ubuntu-latest	10m 20s
Link Check	1m 38s
CPython 3.13-ubuntu-latest	8m 50s
CPython 3.13t-ubuntu-latest	9m 2s
DocTest	1m 5s
Test using minimum dependencies and supported Python	40s
Make an sdist	13s
Test async's minimum dependencies and Python	40s
Install from SDist and Test	43s
	48m 25s

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