Add Arduino Nano Every to analogReference() page

[Jorgetrujilloroman]

To avoid confusion, as in this Forum thread, add Arduino Nano Every to the Arduino megaAVR Boards, next to the UNO WiFi Rev2 on the analogReference() Function page.

[Azat-pixel]

void setup() {
pinMode(13, OUTPUT); // sets the digital pin 13 as output
}

void loop() {
  digitalWrite(13, HIGH); // sets the digital pin 13 on
  delay(1000);            // waits for a second
  digitalWrite(13, LOW);  // sets the digital pin 13 off
  delay(1000);            // waits for a second
}