Renames OC-Feature-Vector to OC-Supported-Features.
Renamed OC-Features to OC-Feature-Vector.

Described the OC-Sequence-Number semantics when the
value overflows.. and added a small pseudo code to
illustrate the algorithm.

Clarified the use of OC-Report-Type, when a new value
is needed and what it implies..

Clarified that a new report type implies an allocation
of a new feature.

Clarified how to extend the OC-OLR and when a new
report type is needed in that context.

Signed-off-by: Jouni Korhonen <jouni.korhonen@broadcom.com>