fix ipf.5

[Timo Buhrmester <timo%math.uni-bonn.de@localhost>]

There's a rogue fragment of a sentence in ipf.5, the following patch removes it.

Cheers,
Timo Buhrmester

--- external/bsd/ipf/dist/man/ipf.5.orig	2015-03-19 22:15:46.000000000 +0100
+++ external/bsd/ipf/dist/man/ipf.5	2015-03-19 22:15:42.000000000 +0100
@@ -326,8 +326,6 @@
 possible to match on them in different ways. IPFilter allows you to use
 the following logical operations:
 .IP "< x"
-is true if the port number is greater than or equal to x and less than or
-equal to y
 is true if the port number in the packet is less than x 
 .IP "<= x"
 is true if the port number in the packet is less than or equal to x