Merge pull request w3c#293 from foolip/update-wpt-url

Update web-platform-tests URLs

Author: astearns

motion-1/Overview.bs

@@ -13,7 +13,7 @@ Editor: Dirk Schulze, Adobe Systems Inc., dschulze@adobe.com, w3cid 51803
 Editor: Shane Stephens, Google, shanestephens@google.com, w3cid 47691
 Editor: Jihye Hong, LG Electronics, jh.hong@lge.com, w3cid 79168
 Editor: Eric Willigers, Google, ericwilligers@google.com, w3cid 67534
-Test Suite: https://github.com/w3c/web-platform-tests/tree/master/css/motion-1
+Test Suite: https://github.com/web-platform-tests/wpt/tree/master/css/motion
 Abstract: Motion path allows authors to position any graphical object and animate it along an author specified path.
 </pre>