`DataFrame` row_count and col_count format should be better specified

[freddyaboulton]

We should also rename col_count to column_count as all the other column related parameters have column in the name

[freddyaboulton]

@hannahblair @abidlabs do you know what it means to be better specified? I took this directly from #10471

[abidlabs]

I don't remember exactly, but happy to look into this