[master] ebb79ec63 clarify vmod std changes

[Nils Goroll]

commit ebb79ec634cf47ee7df524c1e7ecf10eff6dec29
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Mon Mar 11 13:45:21 2019 +0100

    clarify vmod std changes

diff --git a/doc/sphinx/whats-new/changes-trunk.rst b/doc/sphinx/whats-new/changes-trunk.rst
index bfbe962da..367ce952e 100644
--- a/doc/sphinx/whats-new/changes-trunk.rst
+++ b/doc/sphinx/whats-new/changes-trunk.rst
@@ -77,8 +77,9 @@ changed the ``builtin.vcl``. See
 VMODs
 =====
 
-New type-conversion functions have been added to :ref:`vmod_std(3)`,
-and the previous conversion functions are now deprecated. See
+The type-conversion functions in :ref:`vmod_std(3)` have been reworked
+to make them more flexible and easier to use. The ``std.``\ *x2y*
+conversion functions are now deprecated. See
 :ref:`whatsnew_upgrading_std_conversion_2019_03`.
 
 The function :ref:`vmod_directors.lookup` has been added to