The xs-network-names external_id is no longer used or populated, so remove
its documentation.
<dt><code>xs-network-uuids</code></dt>
<dd>Space-delimited set of the Citrix XenServer network UUIDs with
which this bridge is associated.</dd>
<dt><code>xs-network-uuids</code></dt>
<dd>Space-delimited set of the Citrix XenServer network UUIDs with
which this bridge is associated.</dd>
- <dt><code>xs-network-names</code></dt>
- <dd>Semicolon-delimited set of Citrix XenServer network names with
- which this bridge is associated.</dd>