clarify meaning of limit

[philvarner]

The correct behavior is what's defined in OGC API Part 1 - http://docs.opengeospatial.org/is/17-069r3/17-069r3.html

7.15.8. Error situations
...
A 400 will be returned in the following situations:
...
    If query parameter limit is not an integer or not between minimum and maximum;