Add hint MISO/MOSI -> CIPO/COPI

The Arduino documentation uses the new CIPO/COPI terminology while the whole arduino core still uses the old MISO/MOSI. 
While I thought about changing everything in the arduino cores, this would break many old sketches so I figuered adding a hint is the way to go.
Also, only changing terminology in this sketch doesn't work for consistency reasons, eg. beginning in line 106.

Author: fritzlb

examples/11.ArduinoISP/ArduinoISP/ArduinoISP.ino

@@ -3,6 +3,9 @@
 // If you require a license, see
 // https://opensource.org/licenses/bsd-license.php
 //
+// Please note that this sketch still uses MISO/MOSI instead of CIPO/COPI.
+// For further details, see https://docs.arduino.cc/learn/communication/spi
+//
 // This sketch turns the Arduino into a AVRISP using the following Arduino pins:
 //
 // Pin 10 is used to reset the target microcontroller.