OVN: Clarify docs about the default transport zone
This patch is extending the documentation about the new transport zones
feature to clarify that if no transport zones are set, the chassis will
belong to a default group.
<dt><code>external_ids:ovn-transport-zones</code></dt>
<dd>
+ <p>
The transport zone(s) that this chassis belongs to. Transport
zones is a way to group different chassis so that tunnels are only
formed between members of the same group(s). Multiple transport
zones may be specified with a comma-separated list. For example:
tz1,tz2,tz3.
+ </p>
+ <p>
+ If not set, the Chassis will be considered part of a default
+ transport zone.
+ </p>
</dd>
</dl>
