ExerciseRun => Correct a comment

NodeApp/src/commander/exercise/ExerciseRunCommand.ts

@@ -86,7 +86,7 @@ class ExerciseRunCommand extends CommanderCommand {
                 spinner.succeed(`The exercise folder contains all the needed files`);
             }
 
-            // dojo.assignment validity
+            // dojo_assignment.json validity
             {
                 const spinner: ora.Ora = ora({
                                                  text  : `Checking ${ Config.assignment.filename } file`,