Update wpt and article urls (#139)

HOWTO.md

@@ -8,7 +8,7 @@ The Window Management API is currently available in Chrome:
 
 Try these basic API demos, which request permission to use info about your screens to open and place windows:
 - https://michaelwasserman.github.io/window-placement-demo
-- https://web.dev/multi-screen-window-placement has a demo: https://window-placement.glitch.me
+- https://developer.chrome.com/articles/window-management/ has a demo: https://window-placement.glitch.me
 
 Here is an example of how to use the API:
 

index.bs

@@ -10,7 +10,7 @@ Editor: Joshua Bell, Google Inc. https://www.google.com/, jsbell@google.com, w3c
 Editor: Mike Wasserman, Google Inc. https://www.google.com/, msw@google.com, w3cid 116970
 Repository: w3c/window-management
 Group: secondscreenwg
-!Test Suite: <a href="https://github.com/web-platform-tests/wpt/tree/master/window-placement">https://github.com/web-platform-tests/wpt/tree/master/window-placement</a>
+!Test Suite: <a href="https://github.com/web-platform-tests/wpt/tree/master/window-management">https://github.com/web-platform-tests/wpt/tree/master/window-management</a>
 !Test Suite: <a href="https://github.com/web-platform-tests/wpt/tree/master/screen-details">https://github.com/web-platform-tests/wpt/tree/master/screen-details</a>
 Logo: logo.svg
 Favicon: logo.svg