Fix a typo in CF V3 API definition (#4330)

Add a missing "," which makes the Example response json invalid

Author: rrashidov

docs/v3/source/includes/api_resources/_deployments.erb

@@ -73,7 +73,7 @@
     "cancel": {
       "href": "https://api.example.org/v3/deployments/59c3d133-2b83-46f3-960e-7765a129aea4/actions/cancel",
       "method": "POST"
-    }
+    },
     "continue": {
       "href": "https://api.example.org/v3/deployments/59c3d133-2b83-46f3-960e-7765a129aea4/actions/continue",
       "method": "POST"