For larger enterprises and companies the ability to have multiple levels of sign off for website content can be important. This is covered by the workflows addon (which out-of-the-box supports only galleries, but is extendible.
If you have found documentation problems that you'd like someone else to solve log an issue to the tracker.
If you'd like to contribute a chunk of documentation to go into a tutorial, also log an issue to the tracker. As a user, it is possible you may find some useful extra tidbits of information there.
If you want to contribute a new tutorial hosted off-site you can submit a link via the button below.