Reword application/credential+ld+json to not refer to "verifiable".

index.html

@@ -3364,7 +3364,8 @@ <h3>JSON-LD</h3>
         </p>
 
         <p>
-This specification restricts the usage of JSON-LD representations of Verifiable Credentials and Verifiable Presentations. JSON-LD <a
+This specification restricts the usage of JSON-LD representations of 
+<a>credentials</a> and <a> presentations</a>. JSON-LD <a
 href="https://www.w3.org/TR/json-ld/#compacted-document-form">compact document
 form</a> MUST be utilized for all representations of the data model described by
 this specification.