corrected note on fade example

Author: tigoe

build/shared/examples/1.Basics/Fade/Fade.pde

@@ -11,7 +11,7 @@ int brightness = 0;    // how bright the LED is
 int fadeAmount = 5;    // how many points to fade the LED by
 
 void setup()  { 
-  // nothing happens in setup 
+  // declare pin 9 to be an output:
   pinMode(9, OUTPUT);
 }