tedu the diagnostic code to detect the presence of the defective Xterasys XN-152

tedu the diagnostic code to detect the presence of the defective Xterasys XN-152
32-bit PCI NIC in a 64-bit PCI slot. The code has never been enabled, never will
be and is unused / unmaintained. Update the man page to not indicate there is a
possibility of the driver detecting this hardware issue.

Input about the man page and Ok chris@