I put links at the bottom of every page I wrote in the Support section, that links to a page here in this forums Tutorials section. Asking for anyone to post about any errors or the need for update.
This has been very rarely used over a period of >5 years. In fact in relatively recent times, someone has gone through & put notifications on some of my wiki pages stating that they are in need of update.
They didn't use the contact link in the Support section of the wiki page, nor did they contact me in any way. I only discovered that these notifications had been placed on the pages by accident, when I went there myself to refer to the page.
That pissed me off.
I haven't fixed any of the pages due to this.
What I have done, is made my own wiki (more than just a Manjaro wiki), on one of my own machines, for my own personal perusal. I'll turn that into a personal bootable MX17 emergency repair disk sometime in the future.
Back on topic:
If someone truly has the enthusiasm & the "content" to participate in the wiki, they ask the question, "how do I make an account?" & then (to the best of my knowledge) they get told to PM Rob or philm. (I still don't know whether Rob is still working for Manjaro behind the scenes?)
The information re. creating a wiki account should be made clearly available somewhere. Probably in more than one place, one of those places should be right up near the top of the wiki's main index page.