Clarify conformance requirements for id value.

Co-authored-by: Ted Thibodeau Jr <[email protected]>

Author: msporny

index.html

@@ -1883,9 +1883,9 @@ <h2>Verification Methods</h2>
       <p>
 A [=DID document=] can express [=verification methods=], as defined in Section
 <a data-cite="CID#verification-methods">2.2: Verification Methods</a> of
-[[[CID]]] with the added restriction that the `id` value MUST conform to Section
-[[[#did-url-syntax]]] or Section [[[#relative-did-urls]]] and the `controller`
-value MUST conform to the Section [[[#did-syntax]]]. See
+[[[CID]]] with the added restrictions that (a) the `id` value MUST conform to
+Section [[[#did-url-syntax]]] or Section [[[#relative-did-urls]]] and (b) the
+`controller` value MUST conform to Section [[[#did-syntax]]]. See
 <a data-cite="CID#verification-methods">Section 2.2: Verification Methods</a>
 of the [[[CID]]] specification for a description of [=verification methods=].
       </p>