Merge "simpleperf: Add doc for monitoring different events on different cores" into main am: 7b320cb199 am: f14cdbc0c1

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2810673

Change-Id: I7ad42a196d074e3ffbd5daeb43885594690dad68
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>