Fix op-proposer to op-supervisor

Should reference op-supervisor

Author: zainbacchus

pages/stack/interop/message-passing.mdx

@@ -85,7 +85,7 @@ sequenceDiagram
     dstXdom->>dstContract: 5. Call with provided calldata
 ```
 
-1.  Before the executing message is processed, the log event of the initiating message has to get to `op-proposer` on the destination chain.
+1.  Before the executing message is processed, the log event of the initiating message has to get to `op-supervisor` on the destination chain.
 
 2.  The application (or a contract calling on the application's behalf) calls [`L2ToL2CrossDomainMessenger.SendMessage.relayMessage`](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/src/L2/L2ToL2CrossDomainMessenger.sol#L156-L216).
     This call includes the message that was sent (`_sendMessage`), as well as the [fields required to find that message (`_id`)](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/interfaces/L2/ICrossL2Inbox.sol#L4-L10).