small fixes

lib/pages/add_account.dart

@@ -39,7 +39,7 @@ class AddAccountPage extends HookWidget {
       return null;
     }, [selectedInstance.value]);
 
-    // show a modal with a list of instance checkboxes
+    /// show a modal with a list of instance checkboxes
     selectInstance() async {
       final val = await showModalBottomSheet<String>(
         backgroundColor: Colors.transparent,

lib/stores/accounts_store.dart

@@ -88,7 +88,7 @@ abstract class _AccountsStore with Store {
   void load() async {
     final prefs = await SharedPreferences.getInstance();
 
-    // I barely understand what I did. Long story short it asserts a
+    // I barely understand what I did. Long story short it casts a
     // raw json into a nested ObservableMap
     nestedMapsCast<T>(String key, T f(Map<String, dynamic> json)) =>
         ObservableMap.of(