[4.1] e8fcf40 Clarify description of fetch_failed counter.

[PÃ¥l Hermunn Johansen]

commit e8fcf408e40b745944a4b83df1b4c6af71eb3d59
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Fri Jan 13 09:54:27 2017 +0000

    Clarify description of fetch_failed counter.
    
    Fixes #1704
    
    Conflicts:
    	include/tbl/vsc_f_main.h

diff --git a/include/tbl/vsc_f_main.h b/include/tbl/vsc_f_main.h
index ab926d9..9d05eff 100644
--- a/include/tbl/vsc_f_main.h
+++ b/include/tbl/vsc_f_main.h
@@ -184,7 +184,7 @@ VSC_F(fetch_304,		uint64_t, 1, 'c', 'i', info,
 	"beresp with no body because of 304 response."
 )
 VSC_F(fetch_failed,		uint64_t, 1, 'c', 'i', info,
-    "Fetch failed (all causes)",
+    "Fetch failed (all causes), where we do get hold of the backend.",
 	"beresp fetch failed."
 )
 VSC_F(fetch_no_thread,		uint64_t, 1, 'c', 'i', info,