Incorrect usage of @section in Doxygen documentation?

There is the following warning in section command's [documentation](https://www.doxygen.nl/manual/commands.html#cmdsection):

> This command only works inside related page documentation and not in other documentation blocks!

In our coding convention, it is recommended to be used for error codes documentation:

- If a function can return multiple error codes, use a errors section (`@section errors_section Errors`) to document the
possible errors. Use `man 2 write` as an example for a good errors section.

I found one usage of `@section` in `celix_threads.h`, and checked our online [documentation](https://nightlies.apache.org/celix/2.4.0/). Unfortunately, utils library is not included in the documentation.
I'm not sure whether the current usage is correct and can produce the intended documentation.

PS: Currently I am working on Celix documentation translation so that it can be used for some internal training program in my day job. I'll go back to this issue after the translation is complete.

Inizia leggendo l’uso di @section in celix_threads.h e confrontalo con la documentazione del comando section di Doxygen. Verifica se la libreria utils e la relativa documentazione generata includono la sezione errors prevista. Il lavoro è completato quando si è determinato se l’uso è valido e lo si è documentato o corretto, se necessario.

Scritto dal modello di indicizzazione a partire dal testo della issue.