removed the code already written for exception exercice (#6284)

Co-authored-by: Marya <111139605+MaryaBelanger@users.noreply.github.com>

src/content/resources/dart-cheatsheet.md

@@ -1271,13 +1271,7 @@ abstract class Logger {
 void tryFunction(VoidFunction untrustworthy, Logger logger) {
   try {
     untrustworthy();
-  } on ExceptionWithMessage catch (e) {
-    logger.logException(e.runtimeType, e.message); 
-  } on Exception catch (e) {
-    logger.logException(e.runtimeType);
-  } finally {
-    logger.doneLogging();
-  }
+  } // Write your logic here
 }
 
 // Tests your solution (Don't edit!):