top: minimal necessary corrections to the man document

top: minimal necessary corrections to the man document

After experimenting with those 4.5 kernel enhancements
to /proc/<pid>/status, that newly added overview topic
'Memory Types' was found to be in need of some tweaks.

In addition, the 'DATA' description wasn't quite broad
enough since explicit private file mappings impact it.

( lastly, for the record, the 2nd commit referred to )
( below contained an incorrect reference that should )
( have been the original issue 21 commit. instead it )
( showed an invalid SHA-1 hash. i believe i have now )
( identified a flaw in my workflow that produced it. )

Reference(s):
. original patch responding to issue #21
commit e4bbd3ca1abe57bc52e7eff72aa3973ecf67765c
. subsequent patch with invalid commit ref
commit 5dcbcd00fe0978b5e2e8e0a19a34389d896e84d9

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