Update wording about controller property to suggestion by @brentzundel

index.html

@@ -1371,6 +1371,15 @@ <h2>
           </dd>
       </dl>
 
+      <p>
+When a <code><a>controller</a></code> property is present in a
+<a>DID Document</a>, its value expresses one or more <a>DIDs</a>. Any
+<a>verification methods</a> contained in the <a>DID Documents</a> for those
+<a>DIDs</a> SHOULD be accepted as authoritative, such that proofs that satisfy
+those verification methods are to be considered equivalent to proofs provided
+by the <a>DID Subject</a>.
+      </p>
+
       <p class="note" title="Authorization vs authentication">
 Note that Authorization is separate from <a href="#authentication"></a>.
 This is particularly important for key recovery in the case of key loss,
@@ -1394,20 +1403,6 @@ <h2>
   }]
 }
       </pre>
-
-      <p class="note" title="Determining the DID controller">
-If the <code><a>controller</a></code> property is present, its value expresses
-the root of authority for information expressed in the <a>DID Document.</a> If
-the <code><a>controller</a></code> property is not present, the value can be
-inferred to be the same as that of the <code><a>id</a></code> property of the
-<a>DID document</a>. The way to determine how the <a>DID Document</a> can be
-changed is by consulting the relevant <a>DID method</a>. If no <a>verification
-methods</a> are present in the <a>DID Document</a>, then a
-<code><a>controller</a></code> property MUST be present, otherwise the
-the <a>DID document</a> can no longer be changed beyond whatever its present
-value is.
-```suggestion
-      </p>
     </section>
 
     <section>