[master] 377bb58dc doc: Mention the solaris jail change

[Dridi Boukelmoune]

commit 377bb58dc65642d4d6429e65a214942232fe4eb6
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Fri Sep 11 16:13:47 2020 +0200

    doc: Mention the solaris jail change
    
    Yes, I missed at least one varnishd change in my first pass.

diff --git a/doc/sphinx/whats-new/changes-trunk.rst b/doc/sphinx/whats-new/changes-trunk.rst
index 8a0e637f2..0f150d59c 100644
--- a/doc/sphinx/whats-new/changes-trunk.rst
+++ b/doc/sphinx/whats-new/changes-trunk.rst
@@ -27,6 +27,10 @@ A new ``vcc_acl_pedantic`` parameter will turn warnings into errors for the
 case where an ACL entry includes a network prefix, but host bits aren't all
 zeroes.
 
+The ``solaris`` jail has been improved and can reduce privileges even further.
+There is now a new optional ``-j solaris,worker=...`` argument which allows to
+extend the effective privilege set of the worker (cache) process.
+
 Other changes in varnishd
 ~~~~~~~~~~~~~~~~~~~~~~~~~