Merge "Correct error code in attest_key docs." am: b21b4a3663 am: 741884a363 am: fa5c497e56 am: 9271e2c06d

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1662620

Change-Id: I8646adb5a87b7befda60ba9bc45f7691ad1256f4