Description of problem:
identation sucks

checkout the provided url

Steps to Reproduce:
You don't want to reproduce this ;)
  
Actual results:
allow booting; allow bootp; class "pxeclients" {    match if substring(option vendor-class-identifier, 0, 9) = "PXEClient";    next-server <server-ip>; filename "linux-install/pxelinux.0"; }

Expected results:
allow booting; 
allow bootp; 

class "pxeclients" {    
    match if substring(option vendor-class-identifier, 0, 9) = "PXEClient";
    next-server <server-ip>; 
    filename "linux-install/pxelinux.0"; 
}