Merge "Document that some Telecom broadcast and extra keys are dead-ends."...
Merge "Document that some Telecom broadcast and extra keys are dead-ends." into rvc-dev am: f7643e91 am: 7283b11a am: 4587039a am: 140f7bb2 am: eaafcb05
Change-Id: I3014aa946cfc0b60f7b8ae166b6e81c195c16ccc