Links in comment update

[karlsoderby]

All links inside the "Built-in Examples" had links pointing to older tutorials. This PR updates them to point to the docs.arduino.cc hosted tutorials.

[per1234]

There is an inconsistency in the forms of the URLs. ~Half have a trailing slash (e.g., https://docs.arduino.cc/built-in-examples/basics/Blink/ and the other half omit the trailing slash (e.g., https://docs.arduino.cc/built-in-examples/basics/Blink).

Although the URL format without the trailing slash works perfectly well, it results in a redirect to the final URL with the trailing slash. Using the final URL is best practices so I suggest using that form consistently.

[karlsoderby]

Thanks a lot @per1234 for spotting that, all suggestions applied.

[per1234]

Thanks @karlsoderby!