Clarify documentation on TEMP_NOT_METERED API

Test: build
Bug: 165337240
Change-Id: Ifc0843b529e7a205b0e1caf98420adfc377c28e7
1 file changed
tree: 166ec2dd69e99227fc1054526fa984004d61f364
  1. core/
  2. services/
  3. tests/