chore(mempool_p2p): remove deprecated comment from error (#2005)

crates/starknet_mempool_p2p_types/src/errors.rs

@@ -1,7 +1,6 @@
 use serde::{Deserialize, Serialize};
 use thiserror::Error;
 
-// This error is defined even though it's empty to be compatible with the other components.
 #[derive(Debug, Error, Serialize, Deserialize, Clone)]
 pub enum MempoolP2pPropagatorError {
     #[error("Sender request error")]