A description of the setting was added to the page in the 2.4 Moodle Docs wiki. It was removed in a later version wiki though, since it was no longer a new setting, plus the description simply repeated the setting description in the Moodle UI and didn't add any new information.
However, as with all of Moodle Docs, if you notice anything that can be improved, please feel free to log in and edit the wiki.
Thanks.
I didn't find the right solution from the Internet.
