Do we want to detail that this is an exact string match for categories?
Do we want to describe how to do an approximate match?

`To find all categories with the word "Bike" in them, you can do an approximate match as follows:  ?filter~=Bike.  This approximate match can be done on a set of categories as well.  If you want any category that contains the words Mens, Womens, or cloth, you can use ?filter~[Mens,Womens,cloth].`


Also, I don't know:  Is the filter case sensitive?  I don't think it is, but it should be confirmed.  You should state wether or not it is in the document somewhere. (This has to do with the collation order used on the column.  The MySQL default is case sensitive, but I think we have changed it to not be.)