docs: remove duplicate page

docs/content/docs/5.v9/2.guide/19.breaking-changes-in-v9.md

@@ -78,3 +78,40 @@ The types and names have been fixed in v9, if you have been using the unprefixed
 - `localeLocation` -> `$localeLocation`
 - `switchLocalePath` -> `$switchLocalePath`
 - `localeHead` -> `$localeHead`
+
+## Removal of deprecated `dynamicRouteParams` option and legacy dynamic route parameters implementation
+
+Setting dynamic route parameters by setting the `nuxtI18n` property with `definePageMeta` has been fully removed in favor of the [`useSetI18nParams` composable](/docs/api#useseti18nparams), this feature is enabled by default which means the `dynamicRouteParams` option is no longer necessary.
+
+The composable usage is similar to that of the deprecated implementation, see the migration example below:
+
+```html
+<script>
+definePageMeta({
+  nuxtI18n: {
+    en: { id: 'my-post' },
+    fr: { id: 'mon-article' }
+  }
+})
+</script>
+<template>
+  <!-- pages/post/[id].vue -->
+</template>
+```
+
+Should be changed to:
+
+```html
+<script>
+const setI18nParams = useSetI18nParams();
+setI18nParams({
+	en: { id: 'my-post' },
+	fr: { id: 'mon-article' }
+})
+</script>
+<template>
+  <!-- pages/post/[id].vue -->
+</template>
+```
+
+Check out the [Lang Switcher](/docs/guide/lang-switcher#dynamic-route-parameters) guide for more details.