Maintain a consistent number of newlines at end of built-in examples

A single newline at the end of the examples was most common so I fixed all examples that did not follow this convention.

Author: per1234

examples/01.Basics/DigitalReadSerial/DigitalReadSerial.ino

@@ -24,6 +24,3 @@ void loop() {
   Serial.println(buttonState);
   delay(1);        // delay in between reads for stability
 }
-
-
-

examples/02.Digital/BlinkWithoutDelay/BlinkWithoutDelay.ino

@@ -69,4 +69,3 @@ void loop() {
     digitalWrite(ledPin, ledState);
   }
 }
-

examples/02.Digital/Button/Button.ino

@@ -52,4 +52,4 @@ void loop() {
     // turn LED off:
     digitalWrite(ledPin, LOW);
   }
-}
+}

examples/02.Digital/Debounce/Debounce.ino

@@ -89,4 +89,3 @@ void loop() {
   // it'll be the lastButtonState:
   lastButtonState = reading;
 }
-

examples/02.Digital/DigitalInputPullup/DigitalInputPullup.ino

@@ -46,6 +46,3 @@ void loop() {
     digitalWrite(13, HIGH);
   }
 }
-
-
-

examples/02.Digital/StateChangeDetection/StateChangeDetection.ino

@@ -82,12 +82,3 @@ void loop() {
   }
 
 }
-
-
-
-
-
-
-
-
-

examples/02.Digital/tonePitchFollower/tonePitchFollower.ino

@@ -39,9 +39,3 @@ void loop() {
   tone(9, thisPitch, 10);
   delay(1);        // delay in between reads for stability
 }
-
-
-
-
-
-

examples/03.Analog/AnalogInput/AnalogInput.ino

@@ -47,4 +47,4 @@ void loop() {
   digitalWrite(ledPin, LOW);
   // stop the program for for <sensorValue> milliseconds:
   delay(sensorValue);
-}
+}

examples/03.Analog/Fading/Fading.ino

@@ -41,5 +41,3 @@ void loop() {
     delay(30);
   }
 }
-
-

examples/03.Analog/Smoothing/Smoothing.ino

@@ -65,5 +65,3 @@ void loop() {
   Serial.println(average);
   delay(1);        // delay in between reads for stability
 }
-
-