Various fixes for API category changes:

Various fixes for API category changes:
* Followup r80326: clarify description of type property
* Fix r80355: need to use addWhereRange() for the static ORDER BY on cl_type as well, to make sure it flips direction when needed (mixed-direction multi-field ORDER BYs are not indexed)
* Followup r80358: use current not previous value for cl_from, and use >= instead of > . This is the way continues are normally done
* Followup r80362: clarify description for sortkeyprefix property