[css-values] Refer to RFC 6694 rather than its draft.

Author: SimonSapin

biblio.ref

@@ -4263,6 +4263,13 @@
 %R Internet RFC 4647
 %U http://www.ietf.org/rfc/rfc4647.txt
 
+%L RFC6694
+%T The "about" URI Scheme
+%A S. Moonesamy, Ed.
+%D August 2012
+%R RFC 6694
+%U http://tools.ietf.org/html/rfc6694
+
 %L RFC6919
 %T Further Key Words for Use in RFCs to Indicate Requirement Levels
 %A R. Barnes

css-values/Overview.bs

@@ -1616,7 +1616,7 @@ Appendix A: IANA Considerations</h2>
 Registration for the <code>about:invalid</code> URL scheme</h3>
 
 	This sections defines and registers the <code>about:invalid</code> URI,
-	in accordance with the registration procedure defined in <a href="http://tools.ietf.org/html/draft-ietf-appsawg-about-uri-scheme-07">the about: uri scheme RFC draft</a>.
+	in accordance with the registration procedure defined in [[RFC6694]].
 
 
 	The official record of this registration can be found at <a href="http://www.iana.org/assignments/about-uri-tokens/about-uri-tokens.xml">http://www.iana.org/assignments/about-uri-tokens/about-uri-tokens.xml</a>.