[wg/audio] Add incubation clause as suggested during AC review

2024/audio-wg.html

@@ -218,6 +218,15 @@ <h2>
 
         <p><i>Draft state</i> indicates the state of the deliverable at the time of the charter approval. <i>Expected completion</i> indicates when the deliverable is projected to become a Recommendation, or otherwise reach a stable state.</p>
 
+        <p>
+          New work, which has been incubated (for example,
+          in the <a href="https://www.w3.org/groups/cg/audio-comgp/">Audio GC</a>) 
+          and is in scope for one of the existing deliverables,
+          may be adopted and integrated by Audio WG resolution.
+          New work which the Audio WG wishes to pursue, which would form a new Rec-track deliverable,
+          would trigger a rechartering that lists the new deliverable.
+        </p>
+
         <section id="normative">
           <h3>
             Normative Specifications