[4.1] da3d71e Revert "backend threads fail tovcl_backend_error"

[Lasse Karstensen]

commit da3d71e8bd3ec76ea7018b33dfd4efb0821dfaff
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Thu Oct 22 08:35:58 2015 +0100

    Revert "backend threads fail tovcl_backend_error"
    
    This reverts commit ed6dca6b9ced699591470ddae65d3fab862d1b73.
    abandon in vcl_backend_* will take us to vcl_synth{}.

diff --git a/doc/sphinx/users-guide/vcl-built-in-subs.rst b/doc/sphinx/users-guide/vcl-built-in-subs.rst
index 12d3377..a1eba28 100644
--- a/doc/sphinx/users-guide/vcl-built-in-subs.rst
+++ b/doc/sphinx/users-guide/vcl-built-in-subs.rst
@@ -268,8 +268,8 @@ The `vcl_backend_fetch` subroutine may terminate with calling
 
   ``abandon``
     Abandon the backend request. Unless the backend request was a
-    background fetch, control is passed to :ref:`vcl_backend_error`
-    with ``resp.status`` preset to 503.
+    background fetch, control is passed to :ref:`vcl_synth` on the
+    client side with ``resp.status`` preset to 503.
 
 .. _vcl_backend_response: