Add an example of how to use --vrrp-id-offset to configure multiple high available services in the same network.   - Changes as per @bfallonf review comments.
Add an example of how to use --vrrp-id-offset to configure multiple high
available services in the same network.
  - Changes as per @bfallonf review comments.

xiaoping378/openshift-docs,xiaoping378/openshift-docs,xiaoping378/openshift-docs