anchor.diff:  
   Configuring an image change trigger requires the following actions:
   
  -1. Define an `*ImageStream*` that points to the upstream image you want to
  +. Define an `*ImageStream*` that points to the upstream image you want to
   trigger on:
   +
   ====
  
positive.code: 
  You can define multiple Docker registry entries in this file. Alternatively, you
  can also add authentication entries to this file by running the `docker login`
  command. The file will be created if it does not exist.
  
  Kubernetes provides the https://github.com/GoogleCloudPlatform/kubernetes/blob/master/docs/design/secrets.md[Secret]
  resource, which is used to store your configuration and passwords.
  
  To create the `*Secret*` resource from your local `.dockercfg` file, you can run
  following command:
  
  ====
  ----
  $ oc secrets new dockerhub ~/.dockercfg
  ----
  ====
  
  This command generates JSON specification of the Secret resource named
  'dockerhub' and creates the object.
  
  Once you have created your Secret, it must be added to the builder service account
  in order to be used.
  
  ====
  ----
  $ oc secrets add serviceaccount/builder secrets/dockerhub
  ----
  ====
  
  Once you have the `*Secret*` created, you can add a `PushSecret` field into the
  `Output` section of the `BuildConfig` and set it to the name of the `*Secret*`
  that you created, which in the above example is `*dockerhub*`:
  
  ====
  
  ----
  
negative.code: Use the following command to display the webhook URLs associated with a build
  configuration:
  
  ----
  $ oc describe buildConfig <name>
  ----
  
  If the above command does not display any webhook URLs, then no webhook trigger
  is defined for that build configuration.
  