proper async marking for LabelingJobs_Resume

Author: forteddyt

specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2021-03-01-preview/mfe.json

@@ -2444,13 +2444,31 @@
             }
           },
           "202": {
-            "description": "Success"
+            "description": "Success",
+            "headers": {
+              "Location": {
+                "description": "URI to poll for asynchronous operation result.",
+                "type": "string"
+              },
+              "Retry-After": {
+                "description": "Duration the client should wait between requests, in seconds.",
+                "type": "integer",
+                "format": "int32",
+                "default": 60,
+                "maximum": 600,
+                "minimum": 10
+              }
+            }
           }
         },
         "x-ms-examples": {
           "Resume Labeling Job.": {
             "$ref": "./examples/LabelingJob/resume.json"
           }
+        },
+        "x-ms-long-running-operation": true,
+        "x-ms-long-running-operation-options": {
+          "final-state-via": "location"
         }
       }
     },