Update docs/zkEVM/architecture/protocol/etrog-upgrade.md

Co-authored-by: Dra Murphy <149679879+kmurphypolygon@users.noreply.github.com>

Author: EmpieichO

docs/zkEVM/architecture/protocol/etrog-upgrade.md

@@ -6,8 +6,6 @@ Although the Dragonfruit upgrade had some advantages over previous zkEVM version
 
 Before discussing all these, we present the newly launched testnet that coincides with the Etrog upgrade.
 
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 ## Cardona testnet
 
 In addition to the Goërli testnet, a second testnet is launched on Sepolia and it is dubbed Cardona.