usbip: tools: fix module name in man page

usbip: tools: fix module name in man page

Commit 64e62426f40d ("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: 64e62426f40d ("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.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>