update type definitions for unstable_batchedUpdates (#36180)

Summary:
This PR fixes the type definitions for `unstable_batchedUpdates`. The same change was recently made on DefinitelyTyped - see DefinitelyTyped/DefinitelyTyped#63517 for a more detailed explanation

## Changelog

[General] [Fixed] - fix type definition for `unstable_batchedUpdates`

Pull Request resolved: #36180

Test Plan: Note how the typescript defintions now match [the flow definitions](https://github.com/facebook/react-native/blob/43636267011a97490ed7495b08e500c5d0d54872/Libraries/ReactNative/RendererImplementation.js#L99), and note how [the tests in DefinitelyTyped](https://github.com/k-yle/DefinitelyTyped/blob/a4e15e3c2b9c6d689918cbbfa98c02cd26fe7681/types/react-dom/test/react-dom-tests.tsx#L231-L238) are passing.

Reviewed By: christophpurrer, cortinico

Differential Revision: D43367314

Pulled By: lunaleaps

fbshipit-source-id: 74351daaf2c00a372f4e28992d41ebd2cbb1c7cc

types/public/ReactNativeRenderer.d.ts

@@ -140,10 +140,5 @@ export interface GestureResponderHandlers {
 /**
  * React Native also implements unstable_batchedUpdates
  */
-export function unstable_batchedUpdates<A, B>(
-  callback: (a: A, b: B) => any,
-  a: A,
-  b: B,
-): void;
-export function unstable_batchedUpdates<A>(callback: (a: A) => any, a: A): void;
-export function unstable_batchedUpdates(callback: () => any): void;
+export function unstable_batchedUpdates<A, R>(callback: (a: A) => R, a: A): R;
+export function unstable_batchedUpdates<R>(callback: () => R): R;