Set TR link in bikeshed metadata

Author: dontcallmedom

index.bs

@@ -4,6 +4,7 @@ Shortname: webrtc-encoded-transform
 Level: None
 Status: ED
 Group: webrtc
+TR: https://www.w3.org/TR/webrtc-encoded-transform/
 Repository: w3c/webrtc-encoded-transform
 URL: https://w3c.github.io/webrtc-encoded-transform/
 Editor: Harald Alvestrand, w3cid 24610 , Google https://google.com, [email protected]