F27: change description proposal

From https://bugzilla.redhat.com/show_bug.cgi?id=1471708 doc text

Feature: The httpd package now use the threaded, high-performance "event" MPM by default, rather than "prefork" as in previous releases. In conjunction with this change, the default PHP configuration will use FPM (php-fpm) rather than the in-process interpreter (mod_php).

Reason: This change brings Fedora in-line with the recommended defaults of the upstream Apache HTTP Server project, and allows HTTP/2 to be enabled.

Result: The server will handle a larger number of client connections with lower memory requirement.