Update etrog-upgrade.md

ZK-EVM not zkEVM

Author: EmpieichO

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

@@ -34,7 +34,7 @@ We use the same faucet for testnet tokens, here: https://faucet.polygon.technolo
 
 The Etrog upgrade comes with support for most of the EVM's [precompiled contracts](https://www.evm.codes/precompiled?fork=shanghai); ecRecover, SHA-256, identity, modexp, ecAdd, ecMul, and ecPairing. This only leaves out the barely used RIPEMD-160 and blake2f.
 
-Owing to this fact, the Etrog upgrade therefore helps Polygon zkEVM inch closer to becoming a type 2 zkEVM.
+Owing to this fact, the Etrog upgrade therefore helps Polygon zkEVM inch closer to becoming a type 2 ZK-EVM.
 
 The below table displays Polygon zkEVM's precompiled status.