A lot of new users create multiple MongoClient instances as they don't realise it can be reused. 

Let's add a note on the following pages to highlight that MongoClient connections can be reused. In the note, also link the FAQ on connection pooling for those user who wants to read more about it. 

1. https://pymongo.readthedocs.io/en/stable/tutorial.html 
2. https://pymongo.readthedocs.io/en/stable/api/pymongo/mongo_client.html?highlight=mongoclient