Fix wording in bin aggregator documentationj
Fix wording in bin aggregator documentationj

rdettai/kairosdb,ppbizapps/kairosdb,ppbizapps/kairosdb,ppbizapps/kairosdb,rdettai/kairosdb,rdettai/kairosdb,kairosdb/kairosdb,rdettai/kairosdb,kairosdb/kairosdb,ppbizapps/kairosdb,kairosdb/kairosdb,kairosdb/kairosdb,rdettai/kairosdb,ppbizapps/kairosdb,kairosdb/kairosdb,kairosdb/kairosdb