docs/docker: Add hostname parameter to examples
docs/docker: Add hostname parameter to examples

Using --hostname to give the container a meaningful name is a good
practice, and make the monitoring dashboard easier to understand

Signed-off-by: Tzach Livyatan <434a324262fc65c9776045522d30d755c828b1aa@scylladb.com>
Message-Id: <20170803081027.6675-1-434a324262fc65c9776045522d30d755c828b1aa@scylladb.com>

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