Add comments about location access proto fields

    }

    optional Location location = 31;

    // How frequently will the user be reminded about location permission grants

    message LocationAccessCheck {

        option (android.msg_privacy).dest = DEST_EXPLICIT;

        // Time in between periodic checks

        optional SettingProto interval_millis = 1 [ (android.privacy).dest = DEST_AUTOMATIC ];

        // Time in between the user granting a location permission and a check

        optional SettingProto delay_millis = 2 [ (android.privacy).dest = DEST_AUTOMATIC ];

    }

    optional LocationAccessCheck location_access_check = 73;