chore: Add comments explaining the existence of NativeDatePickerAndro…

…id (#33159)

Summary:
This PR adds comments explaining the reason why the `NativeDatePickerAndroid.js` file was kept when removing `DatePickerAndroid`(7a77052 ) in order to prevent people from trying to delete it, as this file has no references in the Github repo

## Changelog

[Internal] [Added] - Add comments explaining the existence of NativeDatePickerAndroid

Pull Request resolved: #33159

Test Plan: Ensure builds are still working correctly, although this just adds a comment

Reviewed By: cortinico

Differential Revision: D34487638

Pulled By: lunaleaps

fbshipit-source-id: 42cb7331e98d69ff2f69f19bfbb2e65c063120f7

Libraries/Components/DatePickerAndroid/NativeDatePickerAndroid.js

@@ -11,6 +11,11 @@
 import type {TurboModule} from '../../TurboModule/RCTExport';
 import * as TurboModuleRegistry from '../../TurboModule/TurboModuleRegistry';
 
+/**
+ * This file backs native modules that are used internally at Meta
+ * and this JS spec was intentionally left here. In the meanwhile this
+ * file should not be deleted.
+ */
 export interface Spec extends TurboModule {
   +open: (options: Object) => Promise<Object>;
 }