LP#1681095: add release notes

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

diff --git a/docs/RELEASE_NOTES_NEXT/Administration/Public_catalog_asset_caching.adoc b/docs/RELEASE_NOTES_NEXT/Administration/Public_catalog_asset_caching.adoc
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+Tweaks to Caching/Expiry of Public Catalog Assets
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+The default cache expiration time for static assets (e.g.,
+CSS, image, and JavaScript files) in the public catalog and
+the Kid's PAC has been increased to one year. Links to all
+such assets now have a cache-busting value tacked on as a
+query parameter. This value is refreshed when `autogen.sh` is
+run, but it can also be manually set by adjusting the
+`ctx.cache_key` Template Toolkit variable.