Merge pull request #1594 from koala-lava/master

consistent error output comments

Author: iliakan

1-js/99-js-misc/01-proxy/01-error-nonexisting/solution.md

@@ -19,5 +19,5 @@ function wrap(target) {
 user = wrap(user);
 
 alert(user.name); // John
-alert(user.age); // ReferenceError: Property doesn't exist
+alert(user.age); // ReferenceError: Property doesn't exist "age"
 ```

1-js/99-js-misc/01-proxy/01-error-nonexisting/task.md

@@ -27,6 +27,6 @@ user = wrap(user);
 
 alert(user.name); // John
 *!*
-alert(user.age); // Error: Property doesn't exist
+alert(user.age); // ReferenceError: Property doesn't exist "age"
 */!*
 ```