[css-transitions-2] Update links to Web Animations

Author: birtles

css-transitions-2/Overview.bs

@@ -31,9 +31,9 @@ Abstract: CSS Transitions allows property changes in CSS values to occur smoothl
 Ignored Terms: translate, rotate, scale
 </pre>
 <pre class="anchors">
-urlPrefix: https://w3c.github.io/web-animations/; type: interface; spec: web-animations
+urlPrefix: https://drafts.csswg.org/web-animations/; type: interface; spec: web-animations
     text: Animation
-urlPrefix: https://w3c.github.io/web-animations/; type: dfn; spec: web-animations
+urlPrefix: https://drafts.csswg.org/web-animations/; type: dfn; spec: web-animations
     text: active duration
     text: active time
     text: animation