[Gluster-devel] Update documentation, especially when a change affects the cli.

[Joe Julian]

commit f9ebf5a "remove replace brick with data migration support form 
cli/glusterd" was accepted and did not update the documentation which 
reads":

> ##Migrating Volumes
>
> You can migrate the data from one brick to another, as needed, while the
> cluster is online and available.
>
> **To migrate a volume**
>
> 1.  Make sure the new brick, server5 in this example, is successfully
>      added to the cluster.
>
> 2.  Migrate the data from one brick to another using the following
>      command:
>
>      ` # gluster volume replace-brick  start`
>
>      For example, to migrate the data in server3:/exp3 to server5:/exp5
>      in test-volume:
>
>          # gluster volume replace-brick test-volume server3:/exp3  server5:exp5 start
>          Replace brick start operation successful

Please ensure, as part of review, that anything that affects the cli has 
the documentation changes included.
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