Not sure what you are referring to. In site.conf, I see:
# The following two variables must match the user ID and group ID respectively
# under which apache is running.
# In the apache configuration file (often called httpd.conf) you will find
# User www-data --- this is the $server_userID -- of course it may be wwhttpd or some other name
# Group wwdata --- this is the $server_groupID -- this will have different names also
Arnie