Merge "documenting optimized flash super" into main am: a3b232c3 am:...

Merge "documenting optimized flash super" into main am: a3b232c3 am: b5bb46cd am: 11481b3c am: d28f20f7 am: 5b5ce956

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



Change-Id: Ic5e2dd698fb03f5c970293d3bf1d92ca411cf946
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>