Unified links in tone.adoc.

Author: SeppPenner

Language/Functions/Advanced IO/tone.adoc

@@ -76,10 +76,10 @@ If you want to play different pitches on multiple pins, you need to call `noTone
 [role="example"]
 
 * #EXAMPLE# https://www.arduino.cc/en/Tutorial/BuiltInExamples/toneMelody[Tone Melody^]
-* #EXAMPLE# https://arduino.cc/en/Tutorial/tonePitchFollower[Pitch Follower^]
+* #EXAMPLE# https://www.arduino.cc/en/Tutorial/tonePitchFollower[Pitch Follower^]
 * #EXAMPLE# https://www.arduino.cc/en/Tutorial/BuiltInExamples/toneKeyboard[Tone Keyboard^]
 * #EXAMPLE# https://www.arduino.cc/en/Tutorial/BuiltInExamples/toneMultiple[Tone Multiple^]
-* #EXAMPLE# https://arduino.cc/en/Tutorial/PWM[PWM^]
+* #EXAMPLE# https://www.arduino.cc/en/Tutorial/PWM[PWM^]
 
 --
 // SEE ALSO SECTION ENDS