How to Limit Rows in NasaExoplanetArchive?

I'm trying to limit the number of rows that the query gives me.

This doesn't work, any ideas on how to do it?

```
NasaExoplanetArchive.query_criteria(table="stellarhosts",`orderby="sy_pnum desc", count=3)
```

The entry point mentioned is NasaExoplanetArchive.query_criteria(); start by checking its documented arguments and reproducing the query with the requested ordering. Done means the supported row-limit usage is identified and the query reliably returns only three rows, with the usage documented or demonstrated.

Written by the indexing model from the issue text.