Fixed error in comment

Author: amulya349

libraries/Robot_Control/Melody.cpp

@@ -40,7 +40,7 @@ void RobotControl::playMelody(char* script){
       case 'C': playNote(202, time, modifier); break; // Play a  C#
       case 'd': playNote(190, time, modifier); break; // Play a  D
       case 'D': playNote(180, time, modifier); break; // Play a  D#
-      case 'e': playNote(170, time, modifier); break; // Play an F
+      case 'e': playNote(170, time, modifier); break; // Play an E
       case 'f': playNote(160, time, modifier); break; // Play an F
       case 'F': playNote(151, time, modifier); break; // Play an F#
       case 'g': playNote(143, time, modifier); break; // Play a  G
@@ -97,4 +97,4 @@ void RobotControl::playFile(char* filename){
 
 void RobotControl::stopPlayFile(){
   melody.close();
-}
+}