extensions: libxt_set: Add missing hyphen to --bytes-eq synopsis in manpage

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Florian Westphal <fw@strlen.de>
diff --git a/extensions/libxt_set.man b/extensions/libxt_set.man
index 7012ef2..dbc1586 100644
--- a/extensions/libxt_set.man
+++ b/extensions/libxt_set.man
@@ -43,7 +43,7 @@
 If the packet is matched an element in the set, match only if the
 packet counter of the element is greater than the given value as well.
 .TP
-[\fB!\fP] \fB\-bytes\-eq\fP \fIvalue\fP
+[\fB!\fP] \fB\-\-bytes\-eq\fP \fIvalue\fP
 If the packet is matched an element in the set, match only if the
 byte counter of the element matches the given value too.
 .TP