Docs: Javadoc comment fixups for secure passcode reset methods.

Exceptions corrected for methods and cross references linked up.
Clarification about resetPassword() and work profiles.
Staged at: go/dac-stage/reference/android/app/admin/DevicePolicyManager.html

Test: make ds-docs with output staged and visually checked in DevicePolicyManager page
Bug: 38026339
Change-Id: I3346144193061fad7988c92e0d4be4b341ef7410