doc: remove out of date links and info from packet mmap

The packet_mmap documentation had links to no longer existing web
sites; replace with other site which has similar example.

Support for packet mmap has been in mainline versions of libpcap
for several years.

Signed-off-by: Stephen Hemminger <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/networking/packet_mmap.txt

···
 i) capture network traffic with utilities like tcpdump, ii) transmit network
 traffic, or any other that needs raw access to network interface.
 
-You can find the latest version of this document at:
-    http://wiki.ipxwarzone.com/index.php5?title=Linux_packet_mmap
-
 Howto can be found at:
-    http://wiki.gnu-log.net (packet_mmap)
+    https://sites.google.com/site/packetmmap/
 
 Please send your comments to
     Ulisses Alonso Camaró <[e-mail]>
-    Johann Baudy <[e-mail]>
+    Johann Baudy
 
 -------------------------------------------------------------------------------
 + Why use PACKET_MMAP
···
 is a de facto standard, portable across nearly all operating systems
 including Win32. 
 
-Said that, at time of this writing, official libpcap 0.8.1 is out and doesn't include
-support for PACKET_MMAP, and also probably the libpcap included in your distribution. 
-
-I'm aware of two implementations of PACKET_MMAP in libpcap:
-
-    http://wiki.ipxwarzone.com/		     (by Simon Patarin, based on libpcap 0.6.2)
-    http://public.lanl.gov/cpw/              (by Phil Wood, based on lastest libpcap)
-
-The rest of this document is intended for people who want to understand
-the low level details or want to improve libpcap by including PACKET_MMAP
-support.
+Packet MMAP support was integrated into libpcap around the time of version 1.3.0;
+TPACKET_V3 support was added in version 1.5.0
 
 --------------------------------------------------------------------------------
 + How to use mmap() directly to improve capture process
···
  /* bind socket to eth0 */
  bind(this->socket, (struct sockaddr *)&my_addr, sizeof(struct sockaddr_ll));
 
- A complete tutorial is available at: http://wiki.gnu-log.net/
+ A complete tutorial is available at: https://sites.google.com/site/packetmmap/
 
 By default, the user should put data at :
  frame base + TPACKET_HDRLEN - sizeof(struct sockaddr_ll)