Update getEvents.md: added auctionTimeout event (#6486)

Author: robin-crazygames

dev-docs/publisher-api-reference/getEvents.md

@@ -27,6 +27,7 @@ The available events are:
 | --- | --- | --- |
 | auctionInit   | The auction has started                 | Object containing auction details |
 | auctionEnd    | The auction has ended                   | Object containing auction details |
+| auctionTimeout | The auction has timed out              | Object containing auction details |
 | beforeRequestBids | Bids are about to be requested from adapters (added in 3.x) | Array of adunits in the auction |
 | beforeBidderHttp | bidder network request is about be triggered | Array of Bid request objects |
 | bidRequested  | A bid was requested from a specific bidder | Bid request object |