Fix another comment typo

button_toggle.c

@@ -30,7 +30,7 @@ int main(void) {
             TCNT0 = 0;
         }
 
-        // If it's been 10ms or more since PA7 changed state, // it's not bouncing.
+        // If it's been 10ms or more since PA7 changed state, it's not bouncing.
         if (TCNT0 >= 195) {
             // It's been 10ms since the switch changed.
             if (bouncy_switch_state != debounced_switch_state) {