For SOP's to work, it should be really easy for everyone involved to suggest improvements, discuss the steps, and point out outdated information.
In ClickUp we can comment on Docs, have the comment show up in the MyWork of the manager that gets @mentioned, and they can reply to start a discussion or resolve the comment when it get's fixed.
In SmartSuite we have the ability to @mention someone in SmartDocs, but this clutters the doc, makes it difficult to have a discussion, and the comment can't be marked as 'resolved'.