:: What’s is cPanel
cPanel is a Unix based web hosting control panel that provides a graphical interface and automation tools designed to simplify the process of hosting a web site.
:: How to Change Main Domain DocumentRoot in cPanel
+ Change documentroot

Replace USERNAME and DOMAINNAME.TLD with your info.
Change on this line:

+ Rebuild apache.conf and restarting Apache

:: Links
+ Google
+ ServeInt