Clarify the line about iter_errors.
Clarify the line about iter_errors.

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