[4.1] 0378d5e remove extra [ in the usage

[PÃ¥l Hermunn Johansen]

commit 0378d5ee15a68edb3312aee221d086480793510c
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Tue Jul 26 00:40:20 2016 +0200

    remove extra [ in the usage
    
    Thx @fgs

diff --git a/bin/varnishhist/varnishhist_options.h b/bin/varnishhist/varnishhist_options.h
index bcebdfd..682d1e1 100644
--- a/bin/varnishhist/varnishhist_options.h
+++ b/bin/varnishhist/varnishhist_options.h
@@ -46,7 +46,7 @@
 	)
 
 #define HIS_OPT_P							\
-	VOPT("P:", "[-P <[[cb:]tag:field_num:min:max>]",		\
+	VOPT("P:", "[-P <[cb:]tag:field_num:min:max>]",		\
 	    "Custom profile definition",				\
 	    " Graph the given custom definition defined as: an optional"\
 	    " (c)lient or (b)backend filter (defaults to client), the " \