Add documentation into DefaultReactHostDelegate (#37561)

Summary:
Pull Request resolved: #37561

Add documentation into DefaultReactHostDelegate

changelog: [internal] internal

Reviewed By: cortinico

Differential Revision: D45717456

fbshipit-source-id: b9485db26fa8a6c0e9a2267915e3269276e8138d

Author: mdvacca

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/defaults/DefaultBindingsInstaller.kt

@@ -7,7 +7,12 @@
 
 package com.facebook.react.defaults
 
+import com.facebook.jni.annotations.DoNotStrip
 import com.facebook.react.bridgeless.BindingsInstaller
 import com.facebook.react.common.annotations.UnstableReactNativeAPI
 
-@UnstableReactNativeAPI class DefaultBindingsInstaller : BindingsInstaller(null) {}
+/**
+ * A utility class that provides users a default [BindingsInstaller] class that's used to initialize
+ * [ReactHostDelegate]
+ */
+@DoNotStrip @UnstableReactNativeAPI class DefaultBindingsInstaller : BindingsInstaller(null) {}

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/defaults/DefaultReactHostDelegate.kt

@@ -7,6 +7,7 @@
 
 package com.facebook.react.defaults
 
+import com.facebook.jni.annotations.DoNotStrip
 import com.facebook.react.ReactPackage
 import com.facebook.react.bridge.JSBundleLoader
 import com.facebook.react.bridge.ReactApplicationContext
@@ -19,6 +20,25 @@ import com.facebook.react.common.annotations.UnstableReactNativeAPI
 import com.facebook.react.fabric.ReactNativeConfig
 import com.facebook.react.turbomodule.core.TurboModuleManagerDelegate
 
+/**
+ * A utility class that allows you to simplify the initialization of React Native by setting up a
+ * [ReactHostDelegate] that uses recommended dependencies.
+ *
+ * @param jSMainModulePath Path to your app's main module on Metro. This is used when reloading JS
+ *   during development. All paths are relative to the root folder the packager is serving files
+ *   from. Examples: `index.android` or `subdirectory/index.android`
+ * @param jSBundleLoader Bundle loader to use when setting up JS environment. <p>Example:
+ *   [JSBundleLoader.createFileLoader(application, bundleFile)]
+ * @param reactPackages list of reactPackages to expose Native Modules and View Components to JS
+ * @param jSEngineInstance Object that holds a native reference to the javascript engine
+ * @param bindingsInstaller Object that holds a native C++ references that allow host applications
+ *   to install C++ objects into jsi::Runtime during the initialization of React Native
+ * @param reactNativeConfig ReactNative Configuration that allows to customize the behavior of
+ *   key/value pairs used by the framework to enable/disable experimental capabilities
+ * @param exceptionHandler Callback that can be used by React Native host applications to react to
+ *   exceptions thrown by the internals of React Native.
+ */
+@DoNotStrip
 @UnstableReactNativeAPI
 class DefaultReactHostDelegate(
     override val jSMainModulePath: String,