fix minor typos in Overview.xml

LDP/inprogress/Linux-Networking/Overview.xml

@@ -2469,7 +2469,7 @@ server is not required) and the fact that an administrator mightn't be required
 (if users are able to manage resource sharing). The primary disadvantage of 
 peer networks is the lack of a central control mechanism. Each user controls 
 access to their own workstation's shared files and printers. In a large scale 
-network network, such a security policy is difficult to manage without 
+network, such a security policy is difficult to manage without 
 compromising security. Further, a workstation that is being accessed by peers
 can also be slowed down, inconveniencing the user at that workstation. Hence, 
 its clear that this system is best suited to smaller networks.