Merge "documenting optimized flash super" into main am: a3b232c30c am: b5bb46cd25

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2725774

Change-Id: Ibfadcca56cd38af0f9e8025165df02d1e704aea4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>