Note located URI changes in Release Notes

Note located URI changes in Release Notes

Located URIs now define what org unit and below in the hierarchy will be
matched for a given search scope, rather than the copy-like behaviour
from before; for example, a located URI at BR1 will no longer be found
in a SYS1 search scope; rather, a located URI at SYS1 will be found with
either a SYS1 or a BR1 search scope.

Put some info and rough suggested fix into the release notes.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Bill Erickson <berick@esilibrary.com>