Perfect Setup FC4 - apache + php problem

I followed the steps faithfully as outlined in the Perfect Setup for FC 4 directives.
Almost everything works well except for a few, one of which is a problem with executing .php files. The specific directive I followed:
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Apache With PHP5

apt-get install php php-devel php-gd php-imap php-ldap php-mysql php-odbc php-pear php-xml php-xmlrpc curl curl-devel perl-libwww-perl ImageMagick libxml2 libxml2-devel

Now edit /etc/httpd/conf.d/php.conf and comment out the AddHandler and AddType lines:
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I had to uncomment the items and put them back to work. Now I can execute .php files. Why do we have to comment out those items to begin with?

 

Thank you for your prompt reply. I have not gotten that far in my setup. Now that I know the reason, I can rest assured that I have not done a terrible thing by uncommenting those item.