I was attempting to post a response to a specific UE4 Document, and was led to this site. But I believe my response is valid for most of the Unreal documentation.
This documentation provides no information beyond that already available in the header file.
This documentation provides no examples of how it would be used in a real-world situation.
This documentation provides no links to tutorials or learning documents that would help someone understand how to use this, even though sanctioned examples exist.
This documentation includes no ‘see also’ entries.
There seems to be no alternate Unreal documentation on this subject.
Note that if your think my suggested level of documentation is unreasonable, I would point out that it is typical for entries in the Microsoft SDK documentation.
While this documentation may be valuable as reference for someone already familiar with this topic, I feel that this documentation is useless for anyone coming to this page attempting to learn UE4.
As someone who has been using the Unreal Engine daily for almost ten years, I find this to be an accurate assessment of the current Unreal documentation.