We are still actively working on the spam issue.
InstallGentoo Wiki talk:General rules
A section on reverts might be helpful. Something like:
==Reverts== Try to avoid reverting someone's edits when possible. If a revert is necessary give a rationale for it on the article's talk page. Calmly explain your reasoning. Try to be factual, site reliable sources and come to a consensus or compromise in disputes. Ask for a third opinion and request for comments if necessary. As a last resort ask a wiki admin to resolve the dispute. Use the three-reverts in 24-hours rule with exemption for vandalism. Do not engage in edit wars.
Make small edits section
This might be another helpful section to add. It is a summary of a section from this page which I found helpful because I'm a wiki newbie:
==Make small edits== Edits should stand on their own feet, address one particular concern in the article and be small in scope (not necessarily size). Avoid mixing multiple types of changes in one edit when possible. For example: restyling existing content, fixing typos and adding a new section are all small edits on their own. If they are all done together then they comprise a big edit. Small edits are easy to revert without affecting unrelated changes. They are also easy to refer to on talk pages and see in difference tools. Give a reason for edits in the edit summary, even if it is just "typo". Use the talk page for longer explanations.