Fix ARC doc link for filing bugs

The switch to Monorail switched the Cr-Platform-ARC to Component Platform>ARC,
also switch to domain bugs.chromium.org.

BUG=monorail:1169

Review URL: https://codereview.chromium.org/1844733002

Cr-Commit-Position: refs/heads/master@{#383871}

chrome/common/extensions/docs/templates/articles/getstarted_arc.html

@@ -28,7 +28,7 @@ To test your app, you need three things:
 
 <p>
 Open ARC Welder, attach your APK, and select your options. Click <strong>Launch
-App</strong> to test your app. When testing, <a href="http://goo.gl/megdlG">file
+App</strong> to test your app. When testing, <a href="http://goo.gl/OqdvPe">file
 a bug</a> if something doesn't work, or
 <a href="http://stackoverflow.com/questions/tagged/google-chrome-arc">find us
 on Stack Overflow</a> (tag: google-chrome-arc) for help.