Fix description of excludes in Windows setup

And some subtle grammar.

Closes: #66

Author: KS Chan

docs/windows.rst

@@ -9,11 +9,11 @@ NIC. Then, run sshuttle inside the VM like below::
 
     sshuttle -l 0.0.0.0 -x 10.0.0.0/8 -x 192.168.0.0/16 0/0
 
-10.0.0.0/8 excludes NAT traffics of Vagrant and 192.168.0.0/16 excludes
-traffics to my router.
+10.0.0.0/8 excludes NAT traffic of Vagrant and 192.168.0.0/16 excludes
+traffic to local area network (assuming that we're using 192.168.0.0 subnet).
 
 Assuming the VM has the IP 192.168.1.200 obtained on the bridge NIC (we can
-configure that in Vagrant), we can then ask windows to route all its traffic
+configure that in Vagrant), we can then ask Windows to route all its traffic
 via the VM by running the following in cmd.exe with admin right::
 
      route add 0.0.0.0 mask 0.0.0.0 192.168.1.200