Following last week’s major release of iOS 6 for the iPhone, iPad and iPod touch, Apple quietly rolled out Apple TV Software Update 5.1 for the second- and third-generation Apple TV. This latest update for Apple’s set-top box builds on the user interface enhancements introduced earlier this year, adds support for the Shared Photo Streams feature introduced in iOS 6 and adds several other enhancements including improvements to AirPlay support.…