When a Unity tutorial references something in the documentation, we should be able to find it on the documentation page. The idea is that you could land on a documentation page, not fully understand it, see a link to a Unity Learn tutorial, learn from the tutorial, and then understand what it is and how to use it.
With this feature, Unity could identify what is not covered by their tutorials to ensure most of their documentation is covered, making it easier for people to learn how to use Unity.
I’ve encountered situations too many times where I get an error or a reference to something, go to the documentation, and can’t understand it correctly or find any tutorials that discuss it. Often, the documentation just contains the class/method comment copied and pasted from the code.