asset-hubs: fix emulated tests and deduplicate code

Author: acatangiu

cumulus/parachains/integration-tests/emulated/assets/asset-hub-kusama/src/lib.rs

@@ -49,7 +49,7 @@ pub type RelayToSystemParaTest = Test<Kusama, AssetHubKusama>;
 pub type SystemParaToRelayTest = Test<AssetHubKusama, Kusama>;
 pub type SystemParaToParaTest = Test<AssetHubKusama, PenpalKusamaA>;
 
-/// Returns a `TestArgs` instance to de used for the Relay Chain across integration tests
+/// Returns a `TestArgs` instance to be used for the Relay Chain across integration tests
 pub fn relay_test_args(amount: Balance) -> TestArgs {
 	TestArgs {
 		dest: Kusama::child_location_of(AssetHubKusama::para_id()),