Add tags `local`/`global`/`client` to config docs

[alibektas]

#17058 will split configs into these three different classes, yet right now the only way for a user to know to which config type a config belongs is by checking the source code. In short, generated_config.adoc must be adapted once the mentioned PR has been merged.

[alibektas]

As a reminder to myself and others : We are planning to have additional classes. Here is a non-exhaustive list of them. ( We are still in the thinking phase, so subject to change )

1. crate : Lies between local and global that is crate scoped.