Improved comment

Author: agdl

build/shared/examples/02.Digital/BlinkWithoutDelay/BlinkWithoutDelay.ino

@@ -5,9 +5,12 @@
  can run at the same time without being interrupted by the LED code.
 
  The circuit:
- * LED attached from pin 13 to ground.
- * Note: on most Arduinos, there is already an LED on the board
- that's attached to pin 13, so no hardware is needed for this example.
+ * Use the onboard LED.
+ * Note: Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO 
+  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
+  the correct LED pin independent of which board is used.
+  If you want to know what pin the on-board LED is connected to on your Arduino model, check
+  the Technical Specs of your board  at https://www.arduino.cc/en/Main/Products
 
  created 2005
  by David A. Mellis