Update CameraShield note #21

Job	Run time
build (examples/UnitTestExample)	57s
build (examples/ETHOTA)	56s
build (examples/HelloServer)	57s
build (examples/SDWebServer)	1m 1s
build (examples/MQTTClient)	1m 2s
build (examples/ESPMQTTSClient)	57s
build (examples/StaticIPAddress)	57s
build (examples/UDPClientReceiver)	1m 2s
build (examples/UDPClientSender)	1m 2s
build (examples/UDPClientReceiverDirectPC)	54s
build (examples/UDPClientSenderDirectPC)	58s
build (examples/AsyncUDPServer)	1m 2s
build (examples/AsyncUDPClient)	57s
build (examples/WebSocketClient)	57s
build (examples/WebSocketServer)	59s
build (examples/TCPClient)	1m 1s
build (examples/TCPServer)	1m 2s
build (examples/CameraShield)	1m 4s
build (examples/SPIExample)	51s
build (examples/WireExample)	53s
	19m 29s

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