v3(services): update docs for delete SI

Author: Derik Evangelista

docs/v3/source/includes/experimental_resources/service_instances/_delete.md

@@ -11,13 +11,34 @@ curl "https://api.example.org/v3/service_instances/[guid]" \
 ```
 
 ```
-Example Response
+Example Response for User-provided Service Instances
 ```
 
 ```http
 HTTP/1.1 204 No Content
 ```
 
+```
+Example Response for Managed Service Instance
+```
+
+```http
+HTTP/1.1 202 Accepted
+Content-Type: application/json
+Location: https://api.example.org/v3/jobs/af5c57f6-8769-41fa-a499-2c84ed896788
+```
+
+
+This endpoint deletes a service instance. When deleting a user-provided service instance, this endpoint will
+
+This endpoint deletes a service instance. User provided service instances do not require interactions with
+service brokers, therefore the API will respond synchronously to the delete request. For managed service instances, 
+the API will respond asynchronously. 
+
+If failures occur while deleting managed service instances, the API might execute orphan mitigation steps
+accordingly to cases outlined in the [OSBAPI specification](https://github.com/openservicebrokerapi/servicebroker/blob/master/spec.md#orphan-mitigation)
+
+
 #### Definition
 `DELETE /v3/service_instances/:guid`