Document ExerciseRetryExecutionContext better

}

/**

 * Exercise execution contexts for retry attempts. Disables

 * Exercise execution contexts for retry attempts. Disables the following public API functions:

 * 

 * - describe()

 * - prepareWith()

 * - clear()

 * 

 * This is done because, when retrying, the exercise setup code is re-run completely, however,

 * we do not want to e.g. prepare the exercise again, as all the respective files already exist

 * from the previous try.

 */

class ExerciseRetryExecutionContext extends ExerciseExecutionContext {