Update Adafruit_MCP23017.cpp

Author: PsuFan

Adafruit_MCP23017.cpp

@@ -305,6 +305,12 @@ void Adafruit_MCP23017::setupInterruptPin(uint8_t pin, uint8_t mode) {
   updateRegisterBit(pin, HIGH, MCP23017_GPINTENA, MCP23017_GPINTENB);
 }
 
+/**
+ * Disable a pin for interrupt.
+ *
+ * @param pin Pin to set
+ *
+ */
 void Adafruit_MCP23017::disableInterruptPin(uint8_t pin) {
   // disable the pin for interrupt
   updateRegisterBit(pin, LOW, MCP23017_GPINTENA, MCP23017_GPINTENB);