Section 10.2 of the Installation Guide gives the example setup for dhcpd to enable a PXE boot / network installation. The example is unclear between paragraphs 2 and 4 in that the text in paragraph 4 does not match up with the text in paragraph 2, and there are no clear instructions as to where it goes in the example file. 

After trial and error and comparing with the F20 instructions, I was able to get dhcpd started again. I suggest modifying paragraph 4 to include the whole file as such:

option arch code 93 = unsigned integer 16;
subnet 192.168.1.0 netmask 255.255.255.0 {
        option domain-name-servers 192.168.1.1;
        option routers 192.168.1.1;
        range 192.168.1.11 192.168.1.50;
        authoritative;
        default-lease-time 600;
        max-lease-time 7200;
        ddns-update-style none;
        if option arch = 00:07 {
                filename "uefi/shim.efi";
                } else {
                filename "pxelinux.0";
                }
        next-server 192.168.1.2;
}