Docs: Add missing comma to example responses

Change-Id: I4e01d1bedc487f6ea83b0f3ef6522d0858a38024
diff --git a/resources/Documentation/rest-api-checks.md b/resources/Documentation/rest-api-checks.md
index 7308a18..239405a 100644
--- a/resources/Documentation/rest-api-checks.md
+++ b/resources/Documentation/rest-api-checks.md
@@ -40,7 +40,7 @@
       "checker_uuid": "test:my-checker",
       "state": "NOT_STARTED",
       "url": "https://foo.corp.com/test-checker/results/123",
-      "created": "2019-01-31 09:59:32.126000000"
+      "created": "2019-01-31 09:59:32.126000000",
       "updated": "2019-01-31 09:59:32.126000000"
     },
     {
@@ -49,7 +49,7 @@
       "patch_set_id": 1,
       "checker_uuid": "foo:foo-checker",
       "state": "FINISHED",
-      "created": "2019-01-31 09:59:32.126000000"
+      "created": "2019-01-31 09:59:32.126000000",
       "updated": "2019-01-31 09:59:32.126000000"
     }
    ]
@@ -88,7 +88,7 @@
     "checker_uuid": "test:my-checker",
     "state": "NOT_STARTED",
     "url": "https://foo.corp.com/test-checker/results/123",
-    "created": "2019-01-31 09:59:32.126000000"
+    "created": "2019-01-31 09:59:32.126000000",
     "updated": "2019-01-31 09:59:32.126000000"
   }
 ```
@@ -136,7 +136,7 @@
     "state": "RUNNING",
     "url": "https://foo.corp.com/test-checker/results/123",
     "started": "2019-01-31 09:59:32.126000000",
-    "created": "2019-01-31 09:59:32.126000000"
+    "created": "2019-01-31 09:59:32.126000000",
     "updated": "2019-01-31 09:59:32.126000000"
   }
 ```