[css-mobile] Use WG-NOTE instead of NOTE

Author: xfq

css-mobile/Overview.bs

@@ -25,7 +25,7 @@ Title: CSS Mobile Profile 2.0
 Shortname: css-mobile
 Group: csswg
 Level:
-Status: NOTE
+Status: WG-NOTE
 Work status: abandoned
 TR: https://www.w3.org/TR/css-mobile/
 ED: https://dev.w3.org/csswg/css-mobile/