On the EDK2-Devel mailing list, Michael Kinney of Intel has started a new EDK2 wiki page on UEFI Capsule-Based-Firmware Update/Recovery. Capsule Updates are how UEFI-based firmware updates itself.
Draft of documentation for Signed Capsule Feature:
I have started a draft of Wiki pages that describe how to use and verify the Signed Capsule feature from Jiewen Yao. I have focused this first draft on the system firmware update use case for signed capsules. Please review this content and provide feedback. I will work on the remaining 3 signed capsule use cases while the content for this fist use case is reviewed. I plan to add this content to the edk2 Wiki once the reviews are completed.