LP#1691009: add release notes

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

diff --git a/docs/RELEASE_NOTES_NEXT/Administration/Merge_RTL_and_RTL_stylesheets.adoc b/docs/RELEASE_NOTES_NEXT/Administration/Merge_RTL_and_RTL_stylesheets.adoc
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index 0000000..16a4728
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+++ b/docs/RELEASE_NOTES_NEXT/Administration/Merge_RTL_and_RTL_stylesheets.adoc
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+RTL and LTR Public Catalog Stylesheets Merged
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+The RTL stylesheet for the public catalog,
+`templates/opac/css/style-rtl.css.tt2`, has been merged into the LTR
+one (`templates/opac/css/style.css.tt2`). The combined stylesheet
+template will emit RTL or LTR styles based on the value of
+the `rtl` flag of the active locale. An `rtl` variable is also available
+in the template to allow the correct style to be chosen.
+
+Upgrade notes
++++++++++++++
+Administrators of Evergreen who use RTL locales and who have customized
+`style-rtl.css.tt2` should now incorporate their customizations into
+`style.css.tt2`.