I am new to ubuntu. Recently I tried to change user of htdocs according to many q&a 's available on askUbuntu. I followed these steps:

qayyum@qayyum:~$ who am i

qayyum   pts/0        2014-10-01 15:29 (:0)

qayyum@qayyum:~$ sudo chown -R qayyum:qayyum /opt/lampp/htdocs

qayyum@qayyum:~$ sudo gedit /opt/lampp/etc/httpd.conf

As stated in many answers it worked well. But in file /httpd.confI found users which are not assumed to be there.
Problem
These users were found:

User daemon

Group daemon

</IfModule>

instead of suspected:

User nobody

Group nogroup

Is it ok to chang it to my user name and nogroup?