mention remark-emoji in breaking changes

project-words.txt

@@ -325,6 +325,7 @@ serializers
 setaf
 setext
 shiki
+shortcodes
 showinfo
 sida
 simen

website/docs/migration/v3.mdx

@@ -39,6 +39,7 @@ Docusaurus v3 now uses the following dependencies:
 - TypeScript v5.0+
 - prism-react-renderer v2.0+
 - react-live v4.0+
+- remark-emoji v4.0+
 - mermaid v10.4+
 
 :::warning Upgrading community plugins
@@ -576,6 +577,18 @@ However, this is a new major library version containing breaking changes, and we
 
 :::
 
+### remark-emoji v4.0+
+
+Docusaurus v3 upgrades [`prism-react-renderer`](https://github.com/rhysd/remark-emoji) to v4.0+. This library is to support `:emoji:` shortcuts in Markdown.
+
+:::info How to upgrade
+
+Most Docusaurus users have nothing to do. Users of emoji shortcodes should read the [changelog](https://github.com/rhysd/remark-emoji/blob/master/CHANGELOG.md) and double-check their emojis keep rendering as expected.
+
+> **Breaking Change** Update [node-emoji](https://www.npmjs.com/package/node-emoji) from v1 to v2. This change introduces support for many new emojis and removes old emoji short codes which are no longer valid on GitHub.
+
+:::
+
 ### Mermaid v10.4+
 
 For users of the `@docusaurus/theme-mermaid` package, Docusaurus v3 upgrades [`mermaid`](https://github.com/mermaid-js/mermaid) to v10.4+.