LP#2000482: add a brief release notes entry

Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>

diff --git a/docs/RELEASE_NOTES_NEXT/Architecture/angular5.adoc b/docs/RELEASE_NOTES_NEXT/Architecture/angular5.adoc
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+== Angular and Bootstrap Updates for Staff Interface ==
+
+The Angular staff interface now uses Angular 15 and Bootstrap 5. This
+introduces various changes to how the staff interface styling is
+done; developers should take note.