update documentation for UIManagerProvider interface (#39762)

Summary:
Pull Request resolved: #39762

In an attempt to reduce footprint of React Native Android public APIs we are reducing visibility of classes and interfaces that are not meant to be used publicly OR are public but have no usages.
As part of our analysis, which involved looking for usages inside the Meta codebase and code search in OSS, we've detected that this class/interface is public but it's not used from other packages.

If you are using this class or interface please comment in this PR and we will restate the public access.

changelog: [Android][Changed] Reducing visibility of UIManagerProvider

bypass-github-export-checks

Reviewed By: cortinico

Differential Revision: D49803268

fbshipit-source-id: 8bc261115beae8fe0666ed95b65b01c1772a5d15

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/UIManagerProvider.java

@@ -7,12 +7,16 @@
 
 package com.facebook.react.bridge;
 
+import com.facebook.react.common.annotations.DeprecatedInNewArchitecture;
+
 /**
- * @deprecated since this would be deprecated later as part of Stable APIs with bridge removal and
- *     not encouraged usage.
+ * {@link UIManagerProvider} is used to create UIManager objects during the initialization of React
+ * Native. This was introduced as a temporary interface to enable the new renderer of React Native
+ * in isolation of others part of the new architecture of React Native.
  */
-@Deprecated
+@DeprecatedInNewArchitecture
 public interface UIManagerProvider {
 
+  /* Provides a {@link com.facebook.react.bridge.UIManager} for the context received as a parameter. */
   UIManager createUIManager(ReactApplicationContext context);
 }