Hi iry,
The ticket for this feature is very old and contains some outdated information. The comment you quoted will not work as it is written because the %include functionality does not support wildcards. However, you can achieve the same result by adding the following line on your torrc:
%include /etc/tor/services-enabled/
This will include all the files on /etc/tor/services-enabled/.
You can find a short description of this feature on the tor man page, under the section "The configuration file format":
Configuration options can be imported from files or folders using the %include option with the value being a path. If the path is a file, the options from the file will be parsed as if they were written where the %include option is. If the path is a folder, all files on that folder will be parsed following lexical order. Files starting with a dot are ignored. Files on subfolders are ignored. The %include option can be used recursively.
Best regards,