tools: usb: usbip: remove dead-link from README

tools: usb: usbip: remove dead-link from README

Remove dead-link to Debug Tips document on usbip project wiki
http://usbip.wiki.sourceforge.net/how-to-debug-usbip

Tried and failed find the file in archives. It would be nice to
locate the file and add this to usbip tool.

Reported-by: Ignacio Hernandez-Ros <ignacio@hernandez-ros.com>
Closes: https://lore.kernel.org/all/0101019bdf6ca137-60344502-51d2-4767-a34b-6a7cf1bfdf4a-000000@us-west-2.amazonses.com/
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://patch.msgid.link/20260121165155.13550-1-skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>