[master] 0fb7d872e fix formatting glitch from previous

[Nils Goroll]

commit 0fb7d872e2cf97d34c8e0bebe56732558948bc4c
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Fri Dec 13 14:50:39 2019 +0100

    fix formatting glitch from previous

diff --git a/doc/sphinx/users-guide/storage-backends.rst b/doc/sphinx/users-guide/storage-backends.rst
index 1b4dbddbe..3e9734a30 100644
--- a/doc/sphinx/users-guide/storage-backends.rst
+++ b/doc/sphinx/users-guide/storage-backends.rst
@@ -167,7 +167,7 @@ deprecated_persistent
 
 syntax: deprecated_persistent,path,size {experimental}
 
-*Before using, read `phk_persistent`_!*
+*Before using, read* :ref:`phk_persistent`\ *!*
 
 Persistent storage. Varnish will store objects in a file in a manner
 that will secure the survival of *most* of the objects in the event of