Merge "Add comment for TimeUnit::ONE_MINUTE guardrail"

enum TimeUnit {

  TIME_UNIT_UNSPECIFIED = 0;

  ONE_MINUTE = 1;

  ONE_MINUTE = 1;  // WILL BE GUARDRAILED TO 5 MINS UNLESS UID = SHELL OR ROOT

  FIVE_MINUTES = 2;

  TEN_MINUTES = 3;

  THIRTY_MINUTES = 4;