Update OWNERS status for alcooper

Update scoping comment to reflect the types of reviews/changes I've
been making.

Change-Id: Ida49c4e23401e6f37b1215181b263d6992e7418d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2091723
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747869}

chrome/browser/vr/OWNERS

@@ -2,11 +2,13 @@ mthiesse@chromium.org
 tiborg@chromium.org
 vollick@chromium.org
 
+# WebXR or Browser Test-related
+alcooper@chromium.org
+
 # WebXR-related.
 klausw@chromium.org
 
 # Browser Test-related.
-alcooper@chromium.org
 bsheedy@chromium.org
 
 per-file *permission_context*=file://components/permissions/PERMISSIONS_OWNERS