doxy: cleanup "PU" and "Logical processor" defs in the doc
doxy: cleanup "PU" and "Logical processor" defs in the doc

Don't use two <dt> before a single <dd> (it currently causes a vfill
to appear between the <dt> lines, making the PDF output ugly).

Split out one <dd> for each <dt> instead.



git-svn-id: 14be032f8f42541b1a281b51ae8ea69814daf20e@5072 4b44e086-7f34-40ce-a3bd-00e031736276

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