Direct users to add in the appropriate headers and update the listening
port instead of copy/pasting a config that's already outdated and
probably would otherwise have to be synced with the main example nginx
config.
Since the configuration options on the nginx side already exist in the
sample config, there's no need to tell users to copy-paste those
settings in again.
The /var/tmp directory is not mounted as tmpfs unlike /tmp which is
mounted as such on some distros like Fedora or Arch. Since there isn't
really a benefit to having the cache on tmpfs, this change should allow
for a larger cache if needed without worrying about running out of RAM.
