Fix comments

button_contact.c

@@ -7,13 +7,12 @@ int main(void) {
     // Configure led_pin as an output.
     DDRB |= led_pin;
 
-    // Configure button_pin as an output.
+    // Configure button_pin as an input.
     DDRA &= ~button_pin;
 
     // Activate button_pin's pullup resistor.
     PORTA |= button_pin;
 
-    // Nothing left to do, so just spin.
     while (1) {
         // Turn on the LED when the button is pressed.
         if (PINA & button_pin) {

button_toggle.c

@@ -23,7 +23,6 @@ int main(void) {
     int bouncy_switch_state = 0;
     int debounced_switch_state = 0;
 
-    // Nothing left to do, so just spin.
     while (1) {
         // Use the timer to count how long it's been since button_pin changed state.
         if ((PINA & button_pin) != bouncy_switch_state) {