Fix a typo and be a bit more clear, based on Brice's last post to hwloc-devel. 
Fix a typo and be a bit more clear, based on Brice's last post to
hwloc-devel. 


git-svn-id: 14be032f8f42541b1a281b51ae8ea69814daf20e@3070 4b44e086-7f34-40ce-a3bd-00e031736276

BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc