Links missing to reference for Stream and Print classes in the Library Style Guide

In the body of the [Library Style Guide](https://github.com/arduino/docs-content/blob/main/content/learn/08.contributions/01.arduino-library-style-guide/arduino-library-style-guide.md) users are asked to, quote:

> **Use the established core libraries and styles.**
> [...]
> * Use the `Stream` and `Print` classes when dealing with byte streams.

However there aren't any links to the reference for those classes. Moreover I don't think there is documentation for them yet in these new docs. There's documentation for the `Stream` class [in the Reference](https://www.arduino.cc/reference/en/language/functions/communication/stream/), but it seems there isn't any for the `Print` class (at least judging by a quick search)

Open content/learn/08.contributions/01.arduino-library-style-guide/arduino-library-style-guide.md and inspect the quoted Stream and Print guidance. Check the linked Stream reference and search the documentation for a Print reference; done means the guidance provides appropriate class references, or the missing Print documentation path is clarified.

Written by the indexing model from the issue text.