[Reference] update the configuration reference

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | no
| Applies to    | all
| Fixed tickets |

Move some `versionadded` directive to right position and add missing
type information.
The profiler is disabled by default. I think we should say that and add something in the description that tells users that in the SE, it is enabled in the dev and test environments.