docs: Noted minor API changes in release notes
docs: Noted minor API changes in release notes

Using this CL for a few very small API changes which we want to
flag in the release notes, but don't need more doc than that. See
first comment for doc stage location.

bug: 28588696
bug: 28621470
Change-Id: I1eeaef0c022ca312526914032412645167646c9e

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base