Add spec authors and alphabetize list (WICG#1483)

Update index.bs

Updated spec to include additional editors

index.bs

@@ -6,9 +6,15 @@ Status: CG-DRAFT
 Group: wicg
 Repository: WICG/attribution-reporting-api
 URL: https://wicg.github.io/attribution-reporting-api
+Editor: Akash Nadan, Google LLC. https://google.com, akashnadan@google.com
+Editor: Andrew Paseltiner, Google LLC. https://google.com, apaseltiner@chromium.org
+Editor: Arpana Hosabettu, Google LLC. https://google.com, arpanah@chromium.org
 Editor: Charlie Harrison, Google LLC. https://google.com, csharrison@chromium.org
+Editor: Gilad Barkan, Google LLC. https://google.com, giladbarkan@google.com
 Editor: John Delaney, Google LLC. https://google.com, johnidel@chromium.org
-Editor: Andrew Paseltiner, Google LLC. https://google.com, apaseltiner@chromium.org
+Editor: Nan Lin, Google LLC. https://google.com, linnan@chromium.org
+Editor: Vikas Sahu, Google LLC. https://google.com, vikassahu@google.com
+
 Abstract: An API to report that an event may have been caused by another cross-site event. These reports are designed to transfer little enough data between sites that the sites can't use them to track individual users.
 
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