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.

1 files changed, 4 insertions, 3 deletions

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