Update client/rpc/src/eth/transaction.rs

Co-authored-by: Éloïs <c@elo.tf>

client/rpc/src/eth/transaction.rs

@@ -296,7 +296,7 @@ where
 						)
 						.await
 						.map_err(|err| internal_err(format!("{:?}", err)))?
-						.ok_or(internal_err("Failed to retrieve substrate block hash"))?;
+						.ok_or(internal_err("Failed to retrieve substrate parent block hash"))?;
 
 						self.client
 							.runtime_api()