link to correct spec for mask property

Author: svgeesus

compositing-1/Overview.bs

@@ -4,11 +4,11 @@ Status: ED
 Work Status: Refining
 ED: https://drafts.fxtf.org/compositing-1/
 TR: https://www.w3.org/TR/compositing-1/
+Prepare for TR: no
 Previous Version: https://www.w3.org/TR/2015/CR-compositing-1-20150113/
 Previous Version: https://www.w3.org/TR/2014/CR-compositing-1-20140220/
 Shortname: compositing
-Link Defaults: css-color-4 (property) color, svg (property) mask
-Deadline: 2014-08-17
+Link Defaults: css-color-4 (property) color, css-masking-1 (property) mask
 Level: 1
 Group: fxtf
 Editor: Rik Cabanier, Adobe Systems Inc., cabanier@adobe.com, w3cid 106988