Description

There are few pages about working with arrays, like 

https://docs.mongodb.com/manual/reference/operator/query-array/

https://docs.mongodb.com/manual/tutorial/query-arrays/index.html

But not all operators applicable to arrays are listed there, for example $in, $nin

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)