Fix Usage Example in Install Guide (#73)

* Update Install.md

Using 0,1,2,3 is incorrect, since 0xF8 will collide with a core. Should be only 0,1,2

* Update Install.md

* Add sh type to README code usage example

Author: dennisafa

docs/Install.md

@@ -149,10 +149,12 @@ Make and test openNetVM
 
 3. Run openNetVM manager
 
-    Run openNetVM manager to use 4 cores (1 for displaying statistics, 1 for NIC RX, 1 for NIC TX, and 1 for NF TX), to use 1 NIC port (hexadecimal portmask), 0xF8 for the NF coremask (cores 4, 5, 6, 7), and to use stdout for the statistics console:
-
-    `./onvm/go.sh 0,1,2,3 1 0xF8 -s stdout`
+    Run openNetVM manager to use 3 cores (1 for displaying statistics, 1 for handling TX queues, 1 for handling manager RX queues), to use 1 NIC port (hexadecimal portmask), 0xF8 for the NF coremask (cores 3, 4, 5, 6, 7), and to use stdout for the statistics console:
 
+    ```sh
+    ./onvm/go.sh 0,1,2 1 0xF8 -s stdout
+    ```
+    
     You should see information regarding the NIC port that openNetVM is using, and openNetVM manager statistics will be displayed.
 
 4. Run speed_tester NF