examples/vhost: update usage message

updating vhost usage message to be aligned with the documentation.

Signed-off-by: Herakliusz Lipiec <herakliusz.lipiec@intel.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

examples/vhost/main.c

@@ -636,7 +636,6 @@ us_vhost_usage(const char *prgname)
 	"		--vm2vm [0|1|2]\n"
 	"		--rx-retry [0|1] --mergeable [0|1] --stats [0-N]\n"
 	"		--socket-file <path>\n"
-	"		--nb-devices ND\n"
 	"		-p PORTMASK: Set mask for ports to be used by application\n"
 	"		--vm2vm [0|1|2]: disable/software(default)/hardware vm2vm comms\n"
 	"		--rx-retry [0|1]: disable/enable(default) retries on Rx. Enable retry if destination queue is full\n"
@@ -645,11 +644,12 @@ us_vhost_usage(const char *prgname)
 	"		--mergeable [0|1]: disable(default)/enable RX mergeable buffers\n"
 	"		--stats [0-N]: 0: Disable stats, N: Time in seconds to print stats\n"
 	"		--socket-file: The path of the socket file.\n"
-	"		--tx-csum [0|1] disable/enable TX checksum offload.\n"
-	"		--tso [0|1] disable/enable TCP segment offload.\n"
-	"		--client register a vhost-user socket as client mode.\n"
-	"		--dmas register dma channel for specific vhost device.\n"
-	"		--total-num-mbufs [0-N] set the number of mbufs to be allocated in mbuf pools, the default value is 147456.\n",
+	"		--tx-csum [0|1]: disable/enable TX checksum offload.\n"
+	"		--tso [0|1]: disable/enable TCP segment offload.\n"
+	"		--client: register a vhost-user socket as client mode.\n"
+	"		--dmas: register dma channel for specific vhost device.\n"
+	"		--total-num-mbufs [0-N]: set the number of mbufs to be allocated in mbuf pools, the default value is 147456.\n"
+	"		--builtin-net-driver: enable simple vhost-user net driver\n",
 	       prgname);
 }