Better document remote user in PHP-FPM access.format

[RoSk0]

Description

Default PHP-FPM pool configuration file has the %u option described as remote user in the access.format documentation, but what is a remote user?

In my set up I have PHP-FPM and Nginx talking on the port 9000 on localhost (Kubernetes pod) and user field is always empty in the logs.

I don't expect PHP-FPM to know about my application users, but what should I expect in that field?

[bukka]

It's an auth user set from the basic auth (Authorization: Basic ...). I agree we should clarify it. Feel free to create a PR.

[bukka]

I just created a PR: #14521 . Feel free to suggest better wording if it still does not make sense.