Merge "Document how to use tzalloc()/tzfree() with std::unique_ptr." am: 8995672880 am: 5aeec3b87d

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2636324

Change-Id: Ia51fcd84d82e05f87dd6675b5e3420a15a897e88
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>