Remove "obviously true" statement about other serialization formats.

index.html

@@ -598,10 +598,7 @@ <h3>Use Cases and Requirements</h3>
 A conforming document is either a <a>verifiable credential</a> that MUST be
 serialized using the `application/vc+ld+json` media type or a
 <a>verifiable presentation</a> that MUST be serialized using the
-`application/vp+ld+json` media type. Other serialization formats for the
-conforming document MAY be used, and if they are, further guidance in Section <a
-href="#ecosystem-compatibility"></a> MUST be followed. The <a>conforming
-document</a> MAY be transmitted or stored in any such serialization format.
+`application/vp+ld+json` media type.
         </p>
 
         <p>