Apple has released iOS 10.0.2 (build 14A456), the small update includes multiple bug fixes for iOS 10 on any compatible iPhone or iPad.
The three primary bugs addressed with iOS 10.0.2 include a fix for headphone audio controls randomly not working, a bug with Photos app and iCloud Photo Library, and a fix for an issue with some app extensions.
The small software update is available now to all users who are running iOS 10 or iOS 10.0.1. The easiest way to download the iOS 10.0.2 software update is through the OTA mechanism on the iPhone or iPad itself, accessible from Settings > General > Software Update.
Download & More info: Apple Releases iOS 10.0.2 [Download]