doc: fix MASQUERADE section of man page

The section about MASQUERADE specifies that it takes a single option,
but in reality it takes two: --to-ports and --random.

Signed-off-by: Vlad Dogaru <ddvlad@rosedu.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/extensions/libipt_MASQUERADE.man b/extensions/libipt_MASQUERADE.man
index 8f42993..2dae964 100644
--- a/extensions/libipt_MASQUERADE.man
+++ b/extensions/libipt_MASQUERADE.man
@@ -10,7 +10,7 @@
 .I forgotten
 when the interface goes down.  This is the correct behavior when the
 next dialup is unlikely to have the same interface address (and hence
-any established connections are lost anyway).  It takes one option:
+any established connections are lost anyway).
 .TP
 \fB\-\-to\-ports\fP \fIport\fP[\fB\-\fP\fIport\fP]
 This specifies a range of source ports to use, overriding the default