https://www.arduino.cc/en/Reference/BLEPeripheralEnd

• Indicates return type is boolean but it's actually void: https://github.com/01org/corelibs-arduino101/blob/master/libraries/CurieBLE/src/BLEPeripheral.h#L200
• Example code doesn't contain any calls to blePeripheral.end().
• See Also section on the BLEPeripheral end() reference page contains a link to the BLEPeripheral end() reference page