code: @Nonnull
    public TriggerBuilder <T> forJob (final String jobName)
    {
      m_aJobKey = new JobKey (jobName, null);
      return this;
    }
docs: Set the identity of the Job which should be fired by the produced Trigger -
  a <code>JobKey</code> will be produced with the given name and default
  group.
  
  @param jobName
  the name of the job (in default group) to fire.
  @return the updated TriggerBuilder
  @see ITrigger#getJobKey()