Merge "docs: Clarify when certificate is self-signed" into main am: 69bbd1c84f am: 76ee840072 am: a14b6b8858 am: 8aa1722130 am: 2b33511fd6

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2779947

Change-Id: I66f1abef486c7bef3356e6adbc1acbc8897dfd25
Signed-off-by: Automerger Merge Worker <[email protected]>