Merge "simpleperf: add doc about not complete DWARF-based call graphs." am: e5ad5804b3

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/1582247

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If8b5de1d1fa6f6cb2edc00bc1b1ab44d1df5ff69