iw: update wikipage URL

The URL in the README file was still the old one, which leads to
non-existing page.  Update it with the new one.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/20201027075053.2717839-1-luca@coelho.fi
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
1 file changed