HROC is not for leaves. You can call 1-800-828-5850 and they can tell you what you are eligible for. Depending on your eligibility, a mental health leave is no different than a medical one. If your Dr seems it necessary, then it should be approved. This is a 3rd party, and Target has no say in whether or not it is approved.
If you are making the determination yourself, and feel like you need some time off, you would speak with your leader and HR about a personal leave. This kind of leave is up to Target.