docs: add Android deprecated API removals to Capacitor 9 upgrade guide

docs/main/updating/9-0.md

@@ -0,0 +1,25 @@
+---
+title: Updating to 9.0
+description: Guide for updating Capacitor from v8 to v9 in your app
+slug: /updating/9-0
+---
+
+# Updating from Capacitor 8 to Capacitor 9
+
+In this guide, you'll find steps to update your project to the current Capacitor 9 version as well as a list of breaking changes.
+
+## Breaking changes in @capacitor/android
+
+Capacitor 9 removes the Java APIs that were deprecated in previous major versions. If your app or plugin still uses any of them, replace them as follows.
+
+| Removed | Replacement |
+| :------ | :---------- |
+| `CapConfig(AssetManager, JSONObject)` constructor | `CapConfig.loadDefault(Context)` to load from `capacitor.config.json`, or `CapConfig.Builder` for embedded use |
+| `CapConfig.getObject(String)`, `getString(...)`, `getBoolean(...)`, `getInt(...)`, `getArray(...)` | The typed getters on `CapConfig` for main config values and the `PluginConfig` accessors for plugin config values |
+| `PluginCall.save()` | `setKeepAlive(true)` |
+| `PluginCall.isSaved()` | `isKeptAlive()` |
+| `PluginCall.hasOption(String)` | Typed accessors (`getString(...)`, `getInt(...)`, etc.) |
+| `PluginCall.isReleased()` | No replacement, released calls are managed by the bridge |
+| `Bridge.CAPACITOR_HTTPS_INTERCEPTOR_START` | `CAPACITOR_HTTP_INTERCEPTOR_START`, all proxied requests are handled by it |
+| `Plugin.getConfigValue(String)` | `getConfig()` and the typed accessors on `PluginConfig` |
+| `MessageHandler(Bridge, WebView, Object)` constructor | `MessageHandler(Bridge, WebView)` |

sidebars.js

@@ -32,6 +32,7 @@ module.exports = {
       label: 'Upgrade Guides',
       collapsed: false,
       items: [
+        'main/updating/9-0',
         'main/updating/8-5',
         'main/updating/8-0',
         'main/updating/plugins/8-0',