Fix non-object language in verifiableCredential requirements.

Co-authored-by: Dave Longley <[email protected]>

index.html

@@ -2288,10 +2288,11 @@ <h3>Presentations</h3>
 The <code>verifiableCredential</code> <a>property</a> MAY be present. The value
 MUST be one or more <a>verifiable credential</a> and/or
 <a href="#enveloped-verifiable-credentials">enveloped verifiable credential</a>
-objects. For the avoidance of doubt, the values MUST NOT be non-object values such as
-numbers, strings, or URLs. These types of objects are called
+objects (for the avoidance of doubt, the values MUST NOT be non-object values such as
+numbers, strings, or URLs). These types of objects are called
 <a href="#verifiable-credential-graphs">verifiable credential graphs</a> and
-MUST be secured using a <a href="#securing-mechanisms">securing mechanism</a>.
+MUST express information that is secured using a
+<a href="#securing-mechanisms">securing mechanism</a>.
 See Section <a href="#verifiable-credential-graphs"></a> for further details.
           </dd>
           <dt><var id="defn-holder">holder</var></dt>