ja: rest_qos: Update REST API Reference related to the change of how to add a qos rule with "priority"

How to add a qos rule with "priority" has been changed as follows.

  Before applying this patch:
    curl -X POST -d '{"match": {"priority":"5", "nw_dst": "10.0.0.1", "nw_proto": "UDP", "tp_dst": "5002"},
                      "actions":{"queue": "1"}}' http://localhost:8080/qos/rules/0000000000000001

  After applying this patch:
    curl -X POST -d '{"priority":"5",
                      "match": {"nw_dst": "10.0.0.1", "nw_proto": "UDP", "tp_dst": "5002"},
                      "actions":{"queue": "1"}}' http://localhost:8080/qos/rules/0000000000000001

Along with this, this patch fixes the description of REST API Reference.

Signed-off-by: Minoru TAKAHASHI <takahashi.minoru7@gmail.com>