chore: add docs

Author: mdjastrzebski

website/docs/12.x/docs/api/misc/config.mdx

@@ -7,6 +7,7 @@ type Config = {
   asyncUtilTimeout: number;
   defaultHidden: boolean;
   defaultDebugOptions: Partial<DebugOptions>;
+  concurrentRendering: boolean;
 };
 
 function configure(options: Partial<Config>) {}
@@ -26,6 +27,10 @@ This option is also available as `defaultHidden` alias for compatibility with [R
 
 Default [debug options](#debug) to be used when calling `debug()`. These default options will be overridden by the ones you specify directly when calling `debug()`.
 
+### `concurrentRendering` option
+
+Set to `true` to enable concurrent rendering used in the React Native New Architecture. Otherwise `render` will default to legacy synchronous rendering.
+
 ## `resetToDefaults()`
 
 ```ts

website/docs/12.x/docs/api/render.mdx

@@ -32,6 +32,10 @@ wrapper?: React.ComponentType<any>,
 
 This option allows you to wrap the tested component, passed as the first option to the `render()` function, in an additional wrapper component. This is useful for creating reusable custom render functions for common React Context providers.
 
+#### `concurrentRendering` option
+
+Set to `true` to enable concurrent rendering used in the React Native New Architecture. Otherwise `render` will default to legacy synchronous rendering.
+
 #### `createNodeMock` option
 
 ```ts