Minor change to example comment

Can't be the right word! ;)

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

@@ -41,7 +41,7 @@ int buttonState;             // the current reading from the input pin
 int lastButtonState = LOW;   // the previous reading from the input pin
 
 // the following variables are unsigned long's because the time, measured in miliseconds,
-// will quickly become a bigger number than can't be stored in an int.
+// will quickly become a bigger number than can be stored in an int.
 unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
 unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers