LP#1685840 Release notes for Google Books Preview rewrite

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>

diff --git a/docs/RELEASE_NOTES_NEXT/OPAC/google_books_preview_no_dojo.adoc b/docs/RELEASE_NOTES_NEXT/OPAC/google_books_preview_no_dojo.adoc
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+Google Books Preview rewrite
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+The Google Books Preview functionality in record detail pages has been
+rewritten to modernize its style and optimize its performance:
+
+* The Dojo JavaScript framework is no longer used, saving approximately
+  150K of JavaScript and CSS and four network requests per page load.
+* The Embedded Viewer is not loaded unless a possible preview is found,
+  saving more network and memory overhead.
+* The Google Books Loader is used to load the Embedded Viewer instead of the
+  https://productforums.google.com/forum/#!topic/books-api/lZrq5cWKrTo;context-place=forum/books-api[deprecated
+  Google Loader].
+* All variables are self-contained and do not pollute the global namespace.
+* Event listeners are registered to handle clicks, rather than attaching
+  `href="javascript:function()"` to <a> elements.
+* Book previews are displayed in a panel sized according to the viewport
+  of the browser, improving its appearance on both mobile and desktop
+  browsers.
+* The rewritten code is now served up directly from
+  `/js/ui/default/opac/ac_google_books.js` rather than as a TT2 template.