DOC-2578: Add entry for new premium plugin Image Optimizer in release notes.

Author: kemister85

modules/ROOT/pages/7.6.0-release-notes.adoc

@@ -13,6 +13,7 @@ include::partial$misc/admon-releasenotes-for-stable.adoc[]
 
 {productname} {release-version} was released for {enterpriseversion} and {cloudname} on Wednesday, December 11^th^, 2024. These release notes provide an overview of the changes for {productname} {release-version}, including:
 
+* xref:new-premium-plugin[New Premium plugin]
 * xref:accompanying-premium-plugin-changes[Accompanying Premium plugin changes]
 * xref:accompanying-enhanced-skins-and-icon-packs-changes[Accompanying Enhanced Skins & Icon Packs changes]
 * xref:improvements[Improvements]