Update references and remove empty section

Move webcodecs explainer ref to actual spec
Link to latest sframe (although it is not referenced from the API atm
Remove empty terminology section

Author: dontcallmedom

index.bs

@@ -19,14 +19,9 @@ spec:webidl; type:dfn; text:resolve
 </pre>
 <pre class=biblio>
 {
-  "WEB-CODECS": {
-     "href":
-     "https://github.com/WICG/web-codecs/blob/master/explainer.md",
-     "title": "Web Codecs explainer"
-   },
   "SFRAME": {
      "href":
-     "https://www.ietf.org/archive/id/draft-ietf-sframe-enc-00.html",
+     "https://www.ietf.org/archive/id/draft-ietf-sframe-enc-04.html",
      "title": "Secure Frame (SFrame)"
    }
 }
@@ -47,12 +42,10 @@ which is the output of the encoder part of a codec and the input to the
 decoder part of a codec which allows the user agent to apply encryption
 locally.
 
-The interface is inspired by [[WEB-CODECS]] to
+The interface is inspired by [[WEBCODECS]] to
 provide access to such functionality while retaining the setup flow of
 RTCPeerConnection
 
-# Terminology # {#terminology}
-
 # Specification # {#specification}
 
 The Streams definition doesn't use WebIDL much, but the WebRTC spec does.