Missing code syntax highlighting in some pages

[smellai]

Example:
https://github.com/arduino/reference-en/blob/master/Language/Functions/Digital%20IO/digitalRead.adoc

//[source,arduino] is commented

[SeppPenner]

I would rather open one issue per page where this is found than add all pages in here...

[robsoncouto]

This has been fixed in #365