Errors in second example in section 6.3.4 of draft-03

[englishm]

There are two issues with this example:

moq-transport/draft-ietf-moq-transport.md

Lines 1153 to 1185 in 80a1fc4

	Sending a group on one stream, with a unordered object in the group appearing
	on its own stream.
	~~~
	Stream = 2
	STREAM_HEADER_GROUP {
	Subscribe ID = 2
	Track Alias = 2
	Group ID = 0
	Object Send Order = 0
	}
	{
	Object ID = 0
	Object Payload Length = 4
	Payload = "abcd"
	}
	{
	Object ID = 1
	Object Payload Length = 4
	Payload = "efgh"
	}
	Stream = 6
	OBJECT_STREAM {
	Subscribe ID = 2
	Track Alias = 2
	Group ID = 0
	Object ID = 1
	Payload = "moqrocks"
	}
	~~~

1. The Object id should be unique, not duplicated.
2. We shouldn't be mixing different forwarding preferences within the same track, per earlier text in this same version of the draft:

moq-transport/draft-ietf-moq-transport.md

Lines 975 to 978 in 80a1fc4

	Every Track has a single 'Object Forwarding Preference' and publishers
	MUST NOT mix different forwarding preferences within a single track.
	If a subscriber receives different forwarding preferences for a track, it
	SHOULD close the session with an error of 'Protocol Violation'.

[fluffy]

Good catch.