Improve 6.4.0 release notes further

Author: pwizla

docusaurus/docs/release-notes.md

@@ -29,7 +29,11 @@ New versions (minor or patch) are generally released weekly, on Wednesdays.
 
 ## 6.4.0
 
-This release marks some significant additions and rewrites. We've rethought the dev-related content in the CMS docs, with a clearer table of contents for the development, configuration, and customization aspects of Strapi. We've also added a handy "Copy Markdown" button to the navigation bar on the right, so you can easily copy & paste raw Markdown content from the page into your favorite LLM! Enjoy, and watch out for more AI-related features soon 👀
+This release marks some significant additions and rewrites. We've rethought the dev-related content in the CMS docs, with a **clearer table of contents** for the development, configuration, and customization aspects of Strapi.
+
+We've also added a handy **<Icon name="copy"/> Copy Markdown** button to the navigation bar on the right, so you can easily copy & paste raw Markdown content from the page into your favorite LLM!
+
+Enjoy, and watch out for more AI-related features soon 👀
 
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