add that VCs are not restrictive (#26)

Address #19 by clarifying VC portability is just one possible use case.

index.html

@@ -150,7 +150,7 @@ <h1 id="title">Decentralized Identifier Working Group Charter</h1>
           </li>
           <li>
 DIDs provide a path to service agnostic data portability
-(e.g. switching between Verifiable Credential digital wallet providers).
+(including, but not limited to, switching between Verifiable Credential digital wallet providers).
           </li>
         </ul>