Document endpoints.oauthRegistrationEndpoint for Actor objects

Fixes #409

index.html

@@ -849,6 +849,16 @@
             this endpoint specifies a URI at which a client may acquire an
 	    access token.
           </dd>
+          <dt id="oauthRegistrationEndpoint">oauthRegistrationEndpoint</dt>
+          <dd>
+            If OAuth 2.0 bearer tokens [[RFC6749]] [[RFC6750]] are being used
+            for authenticating
+            <a href="#client-to-server-interactions">client to server
+              interactions</a>,
+            this endpoint specifies a URI at which a client may acquire an
+            new pair of client credentials, which register a given client
+            application with the server.
+          </dd>
           <dt id="provideClientKey">provideClientKey</dt>
           <dd>
             If Linked Data Signatures and HTTP Signatures are being used for