Apply suggestion from @ianswett

Author: ianswett

draft-ietf-moq-transport.md

@@ -1495,7 +1495,7 @@ incurring additional latency.
 Publishers MAY start sending Objects on PUBLISH-initiated subscriptions before
 receiving a PUBLISH_OK response to reduce latency.  Doing so can consume
 unnecessary resources in cases where the Subscriber rejects the subscription
-with REQUEST_ERROR. It can also result in
+with REQUEST_ERROR or sets Forward=0 in REQUEST_UPDATE. It can also result in
 the Subscriber dropping Objects if its buffering limits are exceeded (see
 {{datagrams}} and {{subgroup-header}}).