Apple has released Apple TV Software 2.3.1, the latest update to its HDTV-tethered media player. As a follow-up to version 2.3, the minor update breaks any unauthorized third-party software, such as the media center app Boxee, but no other changes are readily apparent. Reader reports indicate a couple of small bug fixes, however, Apple has yet to update its Apple TV software release notes page to explain what, if anything, has changed. Apple TV Software…