Groups can contain any number of objects (moq-wg#617)

Fixes moq-wg#315

Author: ianswett

draft-ietf-moq-transport.md

@@ -378,7 +378,7 @@ Groups SHOULD be indendepently useful, so objects within a group SHOULD NOT depe
 on objects in other groups. A group provides a join point for subscriptions, so a
 subscriber that does not want to receive the entire track can opt to receive only
 the latest group(s).  The publisher then selectively transmits objects based on
-their group membership.
+their group membership.  Groups can contain any number of objects.
 
 Groups are ordered numerically by their Group ID.