Use definition to include references to other interfaces

webrtc.html

@@ -123,6 +123,7 @@ <h2>Terminology</h2>
     <dfn data-dfn-for="exception" data-cite=
     "!WEBIDL-1#dfn-create-exception">create</dfn> are
     defined in [[!WEBIDL-1]].</p>
+    <p>The callback <dfn data-cite="!WEBIDL-1#common-VoidFunction">VoidFunction</dfn> is defined in [[!WEBIDL-1]].</p>
     <p>The term "throw" is used as specified in [[!INFRA]]: it terminates
       the current processing steps.
     </p>
@@ -140,6 +141,7 @@ <h2>Terminology</h2>
       <dfn>peeridentity</dfn>, <dfn>request an identity assertion</dfn> and
       <dfn>validate the identity</dfn> are defined in [[!WEBRTC-IDENTITY]].
     </p>
+    <p>The <dfn data-cite="WebCryptoAPI/#dfn-AlgorithmIdentifier">AlgorithmIdentifier</dfn> is defined in [[!WebCryptoAPI]].</p>
     <p class="note">
       The general principles for Javascript APIs apply, including the principle
       of <a href="https://w3ctag.github.io/design-principles/#js-rtc">