Merge pull request #759 from EthanTracy/patch-1

Update analogReference.adoc

Author: per1234

Language/Functions/Analog IO/analogReference.adoc

@@ -22,7 +22,7 @@ Configures the reference voltage used for analog input (i.e. the value used as t
 Arduino AVR Boards (Uno, Mega, Leonardo, etc.)
 
 * DEFAULT: the default analog reference of 5 volts (on 5V Arduino boards) or 3.3 volts (on 3.3V Arduino boards)
-* INTERNAL: an built-in reference, equal to 1.1 volts on the ATmega168 or ATmega328P and 2.56 volts on the ATmega32U4 and ATmega8 (not available on the Arduino Mega)
+* INTERNAL: a built-in reference, equal to 1.1 volts on the ATmega168 or ATmega328P and 2.56 volts on the ATmega32U4 and ATmega8 (not available on the Arduino Mega)
 * INTERNAL1V1: a built-in 1.1V reference (Arduino Mega only)
 * INTERNAL2V56: a built-in 2.56V reference (Arduino Mega only)
 * EXTERNAL: the voltage applied to the AREF pin (0 to 5V only) is used as the reference.