library: try different alignment for types, <PIDS> api

library: try different alignment for types, <PIDS> api

Rather than adopt an approach offered below, involving
changing all enumerator names to convey types, perhaps
this much more modest change is a worthwhile 1st step.

By just changing the comments to 'right justification'
it dramatically improves readability, at least it does
to my eye.  Perhaps such an approach can postpone that
massive alternative effort for the foreseeable future.

Reference(s):
http://www.freelists.org/post/procps/newlib-drip-drip,4

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