Revert "Added config example for Varnish 4.0"

This is breaking the docs because the sphinx-php extension isn't updated yet
Merge branch '2.3' into 2.5

* 2.3:
  Revert "Added config example for Varnish 4.0"
Merge branch '2.5'

* 2.5:
  Revert "Added config example for Varnish 4.0"