Update README.md

Author: mpous

2022_ARM_Dev_Summit Workshop - LoRa, LoRaWAN and Learn how to deploy a gateway/README.md

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 ## Conference
 
-ARM Dev Summit 2022 - Virtual [link]([https://www.thethingsnetwork.org/conference/ttc-events/building-your-own-private-lorawan-network-server-and-gateway/](https://devsummit.arm.com/flow/arm/devsummit22/home/page/lp)
+ARM Dev Summit 2022 - Virtual [link](https://devsummit.arm.com/flow/arm/devsummit22/home/page/lp)
 
 ## Location and Date