docs(picker-legacy): remove legacy component (#4468)

Co-authored-by: Brandy Smith <6577830+brandyscarney@users.noreply.github.com>

Author: thetaPC

docs/api/picker-legacy.md

@@ -193,8 +193,6 @@ Below are the config options that Ionic uses.
 | `modalLeave`                | `AnimationBuilder`                                                                | Provides a custom leave animation for all `ion-modal`, overriding the default "animation".                                                                                                                                                                                             |
 | `mode`                      | `Mode`                                                                            | The mode determines which platform styles to use for the whole application.                                                                                                                                                                                                            |
 | `navAnimation`              | `AnimationBuilder`                                                                | Overrides the default "animation" of all `ion-nav` and `ion-router-outlet` across the whole application.                                                                                                                                                                               |
-| `pickerEnter`               | `AnimationBuilder`                                                                | Provides a custom enter animation for all `ion-picker`, overriding the default "animation".                                                                                                                                                                                            |
-| `pickerLeave`               | `AnimationBuilder`                                                                | Provides a custom leave animation for all `ion-picker`, overriding the default "animation".                                                                                                                                                                                            |
 | `platform`                  | [`PlatformConfig`](/docs/angular/platform#customizing-platform-detection-methods) | Overrides the default platform detection methods.                                                                                                                                                                                                                                      |
 | `popoverEnter`              | `AnimationBuilder`                                                                | Provides a custom enter animation for all `ion-popover`, overriding the default "animation".                                                                                                                                                                                           |
 | `popoverLeave`              | `AnimationBuilder`                                                                | Provides a custom leave animation for all `ion-popover`, overriding the default "animation".                                                                                                                                                                                           |

docs/developing/config.md

@@ -258,6 +258,12 @@ 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-legacy-column` components. These components have been removed in Ionic 9. The recommended path forward is to use `ion-picker` inside a modal. Review the [Picker in Modal documentation](../api/picker.md#picker-in-modal) for more information.
+2. Remove any usages of `pickerController`. If using React, remove any usages of the `useIonPicker` hook. These controller-based APIs have been removed in Ionic 9. Use the [Picker](../api/picker.md) component instead.
+3. Remove any usages of the `PickerOptions`, `PickerButton`, `PickerColumn`, and `PickerColumnOption` type exports. These types were associated with the legacy picker and have been removed in Ionic 9.
+
 ## 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.

docs/updating/9-0.md

@@ -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',