net: netdev-features.txt update to Documentation/networking/00-INDEX

Update netdev-features.txt entry in 00-INDEX to incorporate
feedback by Michał Mirosław.

v2: restored tabs that were inadvertently changed to spaces in v1.
sorry for the error.
Signed-off-by: NWillem de Bruijn <willemb@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Documentation/networking/00-INDEX

@@ -135,7 +135,7 @@ multiqueue.txt
 netconsole.txt
 	- The network console module netconsole.ko: configuration and notes.
 netdev-features.txt
-	- Network interface "feature mess and how to get out from it alive".
+	- Network interface features API description.
 netdevices.txt
 	- info on network device driver functions exported to the kernel.
 netif-msg.txt