doc: remove number of commands in vDPA guide

[ upstream commit 7875e78b00bf1be03327d5dff1a32c0d5d430bec ]

There are now 5 supported commands.

Fixes: 6505865 ("examples/vdpa: add statistics show command")

Signed-off-by: David Marchand <david.marchand@redhat.com>

doc/guides/sample_app_ug/vdpa.rst

@@ -38,8 +38,7 @@ where
 * --iface specifies the path prefix of the UNIX domain socket file, e.g.
   /tmp/vhost-user-, then the socket files will be named as /tmp/vhost-user-<n>
   (n starts from 0).
-* --interactive means run the vdpa sample in interactive mode, currently 4
-  internal cmds are supported:
+* --interactive means run the vDPA sample in interactive mode:
 
   1. help: show help message
   2. list: list all available vdpa devices