Anyone, and I mean pretty much anyone with any level of experience with OH is free and encouraged to correct anything that is wrong in any of the docs. There is a link at the bottom of every page in the docs that will take you straight to the github page where you can edit it in the browser and create a PR. See How to file an Issue which has more details.
But one thing to note is I’m unaware of anything that is wrong with the beginner’s documentation. For a time there was a bug in the Network binding which has been fixed for almost a year now that made some of the instructions not work. But the proper solution is to fix the bug, not “fix” the tutorial. The tutorial was correct. The code was broken.