[4.1] f418da9 Add a note to clarify the event function's priv object.

[Lasse Karstensen]

commit f418da9896cf0196eb1154bca9e76e2b60c0e49e
Author: Dag Haavi Finstad <daghf at varnish-software.com>
Date:   Sun Oct 25 20:22:05 2015 +0100

    Add a note to clarify the event function's priv object.

diff --git a/doc/sphinx/reference/vmod.rst b/doc/sphinx/reference/vmod.rst
index 697fc6a..91953b0 100644
--- a/doc/sphinx/reference/vmod.rst
+++ b/doc/sphinx/reference/vmod.rst
@@ -302,7 +302,8 @@ The VCL compiler supports the following private pointers:
 * ``PRIV_VCL`` "per vcl" private pointers are useful for such global
   state that applies to all calls in this VCL, for instance flags that
   determine if regular expressions are case-sensitive in this vmod or
-  similar.
+  similar. The ``PRIV_VCL`` object is the same object that is passed
+  to the VMOD's event function.
 
 The way it works in the vmod code, is that a ``struct vmod_priv *`` is
 passed to the functions where one of the ``PRIV_*`` argument types is