Update loop.adoc

There is a typo in lines 40, 49 and 51.

Line 40:
Was: beginSerial(9600);
Now: Serial.begin(9600);

Line 49:
Was: serialWrite('H');
Now: Serial.write('H');

Line 51:
Was: serialWrite('L');
Now: Serial.write('L');

After I made the  above proposed changes, the syntax agreed with the existing documentation for "Serial.begin" and "Serial.write" and the little demo program started to work as expected.

Sincerely,
ZWahl

Author: ZWahl

Language/Structure/Sketch/loop.adoc

@@ -37,7 +37,7 @@ int buttonPin = 3;
 // setup initializes serial and the button pin
 void setup()
 {
-  beginSerial(9600);
+  Serial.begin(9600);
   pinMode(buttonPin, INPUT);
 }
 
@@ -46,9 +46,9 @@ void setup()
 void loop()
 {
   if (digitalRead(buttonPin) == HIGH)
-    serialWrite('H');
+    Serial.write('H');
   else
-    serialWrite('L');
+    Serial.write('L');
 
   delay(1000);
 }