anchor.diff:  </thead>
   <tbody>
   <tr>
  -  <td>instance_name*</td>
  -  <td>string</td>
  -  <td>The name of the instance provided by the user.</td>
  -</tr>
  -<tr>
     <td>service_id*</td>
     <td>string</td>
     <td>The ID of the service within the catalog above. While not strictly necessary, some brokers might make use of this ID.</td>
  
positive.code: 
  <pre class="terminal">
  {
    "instance_name":     "user-provided-instance-name-here",
    "service_id":        "service-guid-here",
    "plan_id":           "plan-guid-here",
    "organization_guid": "org-guid-here",
  
negative.code: ##### cURL #####
  <pre class="terminal">
  $ curl http://username:password@broker-url/v2/service_instances/:instance_id -d '{
    "service_id":        "service-guid-here",
    "plan_id":           "plan-guid-here",
    "organization_guid": "org-guid-here",
  