[css-overscroll] Update shortname and link to /TR

Author: xfq

css-overscroll-1/Overview.bs

@@ -1,11 +1,12 @@
 <pre class='metadata'>
 Title: CSS Overscroll Behavior Module Level 1
-Shortname: css-overscroll-behavior
+Shortname: css-overscroll
 Level: 1
 Status: ED
 Work Status: Exploring
 Group: CSSWG
-URL: https://drafts.csswg.org/css-overscroll-behavior-1/
+URL: https://drafts.csswg.org/css-overscroll-1/
+TR: https://www.w3.org/TR/css-overscroll-1/
 Editor: Benoit Girard, Facebook, bgirard@fb.com
 Editor: Majid Valipour, Google, majidvp@google.com, w3cid 81464