You just need to add following line in AddHandler :-
AddType application/x-httpd-php .html
After adding it the addhandler section should look like this :-
AddType application/x-httpd-php .php AddType application/x-httpd-php .php4 AddType application/x-httpd-php .php3 AddType application/x-httpd-php .html AddType application/x-httpd-php-source .phps AddType application/x-httpd-php .phtml AddHandler cgi-script .cgi .pl AddType text/html .shtml AddType application/x-tar .tgz AddType text/vnd.wap.wml .wml AddType image/vnd.wap.wbmp .wbmp AddType text/vnd.wap.wmlscript .wmls AddType application/vnd.wap.wmlc .wmlc AddType application/vnd.wap.wmlscriptc .wmlsc