README.md: Remove misleading sentence on sgsnemu

As reported by Viktor Tsymbalyuk, "Use the same LAN switch as the one
your SGSN is connected to." is of course completely bogus.  As long as
you have IP routing in place, it doesn't matter at all which switch you
are using.

Change-Id: I748752337b863b317d2899017b1dc255ced2515d

README.md

@@ -263,8 +263,7 @@ following:
 
 1. Install sgsnemu on a Linux Box. See under installation above.
 2. Connect your Linux box with sgsnemu installed to the GPRS core
-network. Use the same LAN switch as the one your SGSN is connected
-to. You also need a free IP address that can be used by sgsnemu.
+network. You also need a free IP address that can be used by sgsnemu.
 3. You need to configure networking in terms of interface address,
 subnet mask and default route. See the Linux Networking HOWTO for
 details.