[6.0] 6f65332ee MAIN.summs documentation

[Dridi Boukelmoune]

commit 6f65332eeb5cd88b9c58c7d0a933e8260d81d2d8
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Mon May 7 14:45:44 2018 +0200

    MAIN.summs documentation
    
    Ref #2672

diff --git a/bin/varnishd/VSC_main.vsc b/bin/varnishd/VSC_main.vsc
index fd9a4e682..4fe84d849 100644
--- a/bin/varnishd/VSC_main.vsc
+++ b/bin/varnishd/VSC_main.vsc
@@ -11,6 +11,9 @@
 	:level:	debug
 	:oneliner:	stat summ operations
 
+	Numer of times per-thread statistics were added to the
+	global counters.
+
 .. varnish_vsc:: uptime
 	:oneliner:	Child process uptime
 	:format:	duration