Fixed typo on etna-upgrade-motivation.mdx (#67)

content/common/multi-chain-architecture/etna-upgrade-motivation.mdx

@@ -34,7 +34,7 @@ The Etna upgrade will remove the requirement for L1 validators to validate the P
 
 To use the interoperability features of Avalanche, L1 validators will still need to register their validator set with the P-Chain of the Primary Network. For this each L1 validator will need to pay a continous fee. This fee is independent of the number of transactions on the L1, the number of cross-chain messages, and the number of validators of the L1. Current estimations are that this fee will be around 1 to 10 AVAX per month per validator.
 
-This will remove the significant economic barrier, giving more sovereignty to L1 creators and validators, while preserving interoperability and econimc secuirty for the Primary Network.
+This will remove the significant economic barrier, giving more sovereignty to L1 creators and validators, while preserving interoperability and economic security for the Primary Network.
 
 ### Running Costs