Clarify the use of ldes:sequencePath in tree:path in addition to ldes:timestampPath

[rorlic]

It's a detail, but in section 3.5.2. Ordered it says:

The client in ordered mode MUST check, during the initialization phase, whether ldes:timestampPath and/or ldes:sequencePath is set. If not, it MUST return an error, as order cannot be guaranteed.

but further down there is no more mentioning of ldes:sequencePath:

A client MUST check whether the ldes:timestampPath is used in the tree:path. Only then can the relation be used for ordering.

Maybe add and/or ldes:sequencePath again?