Merge pull request #6224 from joeyates/patch-1

Correct typo in example app.json for healthchecks

docs/deployment/zero-downtime-deploys.md

@@ -158,6 +158,7 @@ One or more healthchecks can be defined in the `app.json` file - see the [deploy
             "attempts": 3
         }
     ]
+  }
 }
 ```