usbip: tools: fix module name in man page

Commit 64e62426 ("staging: usbip: edit Kconfig and rename
CONFIG options") renamed the module usbip as usbip-host, but the
example in the man page still reports the old module name.

Fix the module name in usbipd.8

Fixes: 64e62426 ("staging: usbip: edit Kconfig and rename CONFIG options")
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Acked-by: matt mooney <mfm@muteddisk.com>
Link: https://lore.kernel.org/r/20200618000818.1048203-1-borneo.antonio@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/usb/usbip/doc/usbipd.8

@@ -73,7 +73,7 @@ USB/IP client can connect and use exported devices.
 
 .SH EXAMPLES
 
-    server:# modprobe usbip
+    server:# modprobe usbip-host
 
     server:# usbipd -D
         - Start usbip daemon.