top: normalize 2 former SUSE only out-of-memory fields

top: normalize 2 former SUSE only out-of-memory fields

Now that the conditional OOMEM_ENABLE has been removed
and all users exposed to those 'out of memory' fields,
it's about time we added them to the top man document.

But before doing so, it's long past time that they are
normalized to at last remedy this kind of foolishness:

. excessive width on that oomem score itself (8 vs. 4)
. some potentially confusing names inherited from suse

Reference(s):
. removal of misguided OOMEM_ENABLE
commit 64238730fa45e92bc40b2aa28d107c2469ac29e9

Signed-off-by: Jim Warner <james.warner@comcast.net>