Help system (wiki) for WordPress admin users?

Question

Wiki engines

There is a large online store on WordPress with which various managers of the client's company work, etc. Many operations, algorithms, CRM, etc.
They asked to implement help for employees directly in WordPress.
Any ready-made plugin ala wiki do not tell me? with external access restriction - for WordPress admin users only.
ps: I think it’s okay not to worry, take a simple one: DokuWiki and that’s it? but this is an outbox solution...

Answer 1

Just paste the link in the admin panel, and place the wiki on a subdomain