Update docs for descend method
Update docs for descend method

eodolphi/jsonschema,sightmachine/jsonschema,Julian/jsonschema,eodolphi/jsonschema,jamesmarva/jsonschema,Julian/jsonschema,varunarya10/jsonschema,dnephin/jsonschema,mathewmarcus/jsonschema,python-jsonschema/jsonschema