Fix minimum brightness comments

setBrightness(0) is actually 1/16 brightness, not 0

Author: sfe-SparkFro

examples/Example_04_SetBrightness/Example_04_SetBrightness.ino

@@ -35,7 +35,7 @@ void setup() {
   Serial.println("Display acknowledged.");
 
   //The input to setBrightness is a duty cycle over 16
-  //So, acceptable inputs to this function are ints between 0 (display off) and 15 (full brightness)
+  //So, acceptable inputs to this function are ints between 0 (1/16 brightness) and 15 (full brightness)
   display.setBrightness(15);
 
   display.print("Milk");

src/SparkFun_Alphanumeric_Display.cpp

@@ -322,7 +322,7 @@ bool HT16K33::clear()
 }
 
 // This function sets the brightness of all displays on the bus.
-// Duty cycle valid between 0 (off) and 15 (full brightness)
+// Duty cycle valid between 0 (1/16 brightness) and 15 (full brightness)
 bool HT16K33::setBrightness(uint8_t duty)
 {
 	bool status = true;
@@ -335,7 +335,7 @@ bool HT16K33::setBrightness(uint8_t duty)
 }
 
 // Set the brightness of a single display
-// Duty cycle valid between 0 (off) and 15 (full brightness)
+// Duty cycle valid between 0 (1/16 brightness) and 15 (full brightness)
 bool HT16K33::setBrightnessSingle(uint8_t displayNumber, uint8_t duty)
 {
 	if (duty > 15) // Error check