Update documentation relating to query service instance by serviceInstanceId.

e.g. GET

http://127.0.0.1:8080/nbi/api/v3/service/c96fb8ec-8552-4956-8a8d-65680aaa57cc

{

    "id": " c96fb8ec-8552-4956-8a8d-65680aaa57cc",

    "name": "NewService_12",

    "@type": "serviceONAP",

    "supportingResource": [],

    "serviceSpecification": {

        "id": "462f84e5-f0e5-44c5-ab95-38fb4bf77064",

         "name": "serviceSpecName",

        "invariantUUID": "88dcb2f0-085b-4548-8b93-0882e37d25d8",

        "@type": "ONAPservice"

    },

    "hasStarted": "yes",

    “state”: “Assigned”,

    "relatedParty": {

        "role": "ONAPcustomer",

        "id": "testcustomer1"

    },

    "type": "service-instance"

{color:#000000}}