docs(picker-legacy): remove legacy component

docs/updating/9-0.md

@@ -258,6 +258,10 @@ npm install @ionic/vue@latest @ionic/vue-router@latest
 npm install @ionic/core@latest
 ```
 
+### Legacy Picker
+
+1. Remove any usages of the `ion-picker-legacy` and `ion-picker-column-legacy` components. These components have been removed in Ionic 9. Use [`ion-picker` component](../api/picker.md#picker-in-modal) instead.
+
 ## Need Help Upgrading?
 
 Be sure to look at the [Ionic 9 Breaking Changes Guide](https://github.com/ionic-team/ionic-framework/blob/main/BREAKING.md#version-9x) for the complete list of breaking changes. This upgrade guide only covers changes that require action from developers.

sidebars.js

@@ -326,14 +326,7 @@ module.exports = {
       type: 'category',
       label: 'Date & Time Pickers',
       collapsed: false,
-      items: [
-        'api/datetime',
-        'api/datetime-button',
-        'api/picker',
-        'api/picker-column',
-        'api/picker-column-option',
-        'api/picker-legacy',
-      ],
+      items: ['api/datetime', 'api/datetime-button', 'api/picker', 'api/picker-column', 'api/picker-column-option'],
     },
     {
       type: 'category',