Detail lookup use in API filtering

[Liorinco]

Hi!

As I lost some time searching why filtering on a contains lookup didn't do the job, until using an exact lookup worked, I recommend to precise, in the expected documention (https://www.django-rest-framework.org/api-guide/filtering/), how to use the filtering with this kind of feature.
I didn't undestand the query parameters must be used same as the query language, so I only expected one kind of filtering (exact, contains...) applied on my query parameter, instead I could add __lookup at the end of this one, to target the king of lookup I needed, until I viewed a commentary on stackoverflow, talking about this syntax.

Maybe this part of the documentation (https://www.django-rest-framework.org/api-guide/filtering/#filtering-and-object-lookups) talking about lookups may mention it in its content.