fix typos (#306)

polkadot/test-parachains/adder/collator/src/main.rs

@@ -129,7 +129,7 @@ fn main() {
 		if let Some(exit_send) = exit_send_cell.try_borrow_mut().expect("signal handler not reentrant; qed").take() {
 			exit_send.fire();
 		}
-	}).expect("Errror setting up ctrl-c handler");
+	}).expect("Error setting up ctrl-c handler");
 
 	let context = AdderContext {
 		db: Arc::new(Mutex::new(HashMap::new())),
@@ -142,7 +142,7 @@ fn main() {
 		key,
 		::std::env::args(),
 		VersionInfo {
-			name: "<unkown>",
+			name: "<unknown>",
 			version: "<unknown>",
 			commit: "<unknown>",
 			executable_name: "adder-collator",