LP#1516022: add release note

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Josh Stompro <stomproj@larl.org>
Signed-off-by: Mike Rylander <mrylander@gmail.com>

diff --git a/docs/RELEASE_NOTES_NEXT/Administration/new_hold_copy_ratio_reporting_source.adoc b/docs/RELEASE_NOTES_NEXT/Administration/new_hold_copy_ratio_reporting_source.adoc
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+New Reporting Source for Hold/Copy Ratios
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+A new reporting source is added, "Hold/Copy Ratio per Bib
+and Pickup Library (and Descendants)", that, for each bib
+that has a hold request on it or any of its components,
+calculates the following:
+
+ * active holds at each OU (including the OU's descendants)
+ * holdable copies at each OU (and its descendants)
+ * the ratio of the above two counts
+ * counts and ratio across the entire consortium
+
+This source differs from the "Hold/Copy Ratio per Bib
+and Pickup Library" source by including all descendants
+of the organization unit one is filtering on.
+
+One use case is allowing a multi-branch system within an
+Evergreen consortium that doesn't do full resource sharing
+to readily calculate whether additional copies should be
+purchased for that system.