LED-Driver.md

@@ -29,6 +29,7 @@ In it, create a file called `SimpleLed.h` and write:
  * THE SOFTWARE.
  */
 
+// Header guards : alternativeley use "#pragma once"
 #ifndef SIMPLE_LED_H
 #define SIMPLE_LED_H
 
@@ -68,6 +69,7 @@ class SimpleLed
 
     protected:
         // Nothing here
+
     private:
         bool state;