Merge "Improve the documentation about adding trivial syscall wrappers." am: 8b8cb2d408

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2052355

Change-Id: I6550b1d75889b3fd0ce617fab12b81b82c8a8345
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>