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You are currently looking at documentation for Umbraco 8 and older versions.
An automated guess is that docs.umbraco.com/umbraco-cms/add-ons/umbraco-plumber/getting-started/ could be the link to the new documentation for Umbraco 9 and newer versions.
In this article, you can read about Umbraco Plumber and how to get started.
Umbraco Plumber Overview
Umbraco Plumber allows the creation of multi-stage approval workflows when writing and publishing content. Umbraco Plumber extends Umbraco's out-of-the-box publishing model with multi-stage and configurable approval workflows. A workflow process comprises of multiple steps and multiple users assigned to the group responsible for providing approval at each step.
A user can be a member of multiple groups in the same workflow. To initiate an approval workflow, a user updates the content, saves their changes, then selects Request publish.
The workflow Dashboard updates to reflect the state of each task, providing an overview of a user's submissions and tasks. Tasks can be approved, cancelled, or rejected from the Dashboard or from the content node Workflow tab. For more information, see the Dashboards and Buttons article.
Getting Started with Umbraco Plumber
You can find some articles below to get started using Umbraco Plumber: