Release note repairs and additions

A handful of repairs and additions to the 2.7 release notes, including:
  * moved copy_edit_links to cataloging
  * making no-fixed-field-defaults-for-ingest an upgrade note
  * adding release note entries for hold targeting of precats and improved
acq fund rendering.

Signed-off-by: Kathy Lussier <klussier@masslnc.org>