staging: unisys: Documentation: Correct a long line in doc

Correct a long line in documentation to respect the
80 character line limit.
Found using checkpatch.pl.

Signed-off-by: R Veera Kumar <vkor@vkten.in>
Link: https://lore.kernel.org/r/20200319085751.GA1928@tulip.local


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>