[master] afaf8246a document return (abandon) from vcl_backend_error {}

[Nils Goroll]

commit afaf8246a57bfc1549a6cf33a2d62e23171021a4
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Sun Mar 17 11:37:05 2019 +0100

    document return (abandon) from vcl_backend_error {}

diff --git a/doc/sphinx/users-guide/vcl-built-in-subs.rst b/doc/sphinx/users-guide/vcl-built-in-subs.rst
index 3b749c835..a911ed005 100644
--- a/doc/sphinx/users-guide/vcl-built-in-subs.rst
+++ b/doc/sphinx/users-guide/vcl-built-in-subs.rst
@@ -504,6 +504,9 @@ with one of the following keywords:
   ``fail``
     see  `fail`_
 
+  ``abandon``
+    see  `abandon`_
+
   ``deliver``
     Deliver and possibly cache the object defined in
     `vcl_backend_error` **as if it was fetched from the backend**, also