This documentation is not using the current rendering mechanism and is probably outdated. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
Target group: Editors
At the time of this writing, the extension's initial and only feature is the support for receiving Webmentions.
Webmentions are a simple way to notify any URL when another site links to it. To a certain extent, Webmentions are a modern successor for Pingbacks, using only HTTP rather than XMLRPC requests. From an editor's point of view, there isn't much to do about receiving webmentions. It's an "under the hood" feature that has to be implemented by the site administrator / developer.