Docs: Use "BOARD_LED_PIN" instead of "13".

Fix examples where pin 13 was used explicitly instead of
BOARD_LED_PIN.  Also change an AVR-specific example in
docs/lang/cpp/booleanvariables.rst to Maple conventions.

2 files changed, 10 insertions, 10 deletions

diff --git a/source/lang/api/delay.rst b/source/lang/api/delay.rst
index 9ef06a0..30bd436 100644
--- a/source/lang/api/delay.rst
+++ b/source/lang/api/delay.rst
@@ -42,17 +42,16 @@ Example
 
 ::
 
-    int ledPin = 13;                 // LED connected to pin 13
-
     void setup() {
-      pinMode(ledPin, OUTPUT);      // sets the digital pin as output
+        // set up the built-in LED pin for output:
+        pinMode(BOARD_LED_PIN, OUTPUT);
     }
 
     void loop() {
-      digitalWrite(ledPin, HIGH);   // sets the LED on
-      delay(1000);                  // waits for a second
-      digitalWrite(ledPin, LOW);    // sets the LED off
-      delay(1000);                  // waits for a second
+        digitalWrite(BOARD_LED_PIN, HIGH);   // sets the LED on
+        delay(1000);                         // waits for a second
+        digitalWrite(BOARD_LED_PIN, LOW);    // sets the LED off
+        delay(1000);                         // waits for a second
     }
 
 .. _lang-delay-seealso:
diff --git a/source/lang/api/digitalwrite.rst b/source/lang/api/digitalwrite.rst
index 376cbc3..bae8db9 100644
--- a/source/lang/api/digitalwrite.rst
+++ b/source/lang/api/digitalwrite.rst
@@ -28,9 +28,10 @@ more slowly as an output than the other pins.
 Example
 -------
 
-The following example sets pin 13 to ``HIGH``, makes a one-second-long
-delay, sets the pin back to ``LOW``, and delays again, causing a
-blinking pattern (you could also use :ref:`lang-toggleled`)::
+The following example sets the built-in LED pin to ``HIGH``, makes a
+one-second-long delay, sets the pin back to ``LOW``, and delays again,
+causing a blinking pattern (you could also use
+:ref:`lang-toggleled`)::
 
     void setup() {
       pinMode(BOARD_LED_PIN, OUTPUT);      // sets the digital pin as output