Update documentation for Query Params: change $nin -> $notin

[Simon Daniel Haan Kristensen]

I found out the $nin operator in the Query Params part of the documentation is wrong, as I found it is actually called $notin in the codebase itself. Changing my code to use $notin also fixed the problem.

I'm not sure how to open a PR for an OSS project, so I'm making an issue instead.

The incorrect line can be found here

[Hugo FOYART]

Hello

Thanks for pointing that out. It has been fixed