Make ETH and ERC-20 transfer clarification

Author: bradleycamacho

pages/stack/protocol/interop/explainer.mdx

@@ -19,6 +19,7 @@ Native OP Stack interoperability provides the ability to read messages and trans
 *   lower fees and lower latency
 *   less fragmentation across the Superchain
 *   improved user experience for developers on the Superchain
+*   secure transfer of ETH and ERC-20s across L2s
 
 ## Secure Message Passing
 Superchain interop includes both the protocol layer message passing and the Superchain ERC20 token specification.