ovn-architecture.xml: remove extra word
<p>
The <code>Port_Binding</code> table has some types of port binding that do
- not correspond directly to logical switch port types. The common common is
+ not correspond directly to logical switch port types. The common is
<code>patch</code> port bindings, known as <dfn>logical patch ports</dfn>.
These port bindings always occur in pairs, and a packet that enters on
either side comes out on the other. <code>ovn-northd</code> connects
