docs: Update mocking.md (#7185)

Author: wnr

docs/guide/mocking.md

@@ -479,7 +479,7 @@ afterAll(() => server.close())
 afterEach(() => server.resetHandlers())
 ```
 
-> Configuring the server with `onUnhandleRequest: 'error'` ensures that an error is thrown whenever there is a request that does not have a corresponding request handler.
+> Configuring the server with `onUnhandledRequest: 'error'` ensures that an error is thrown whenever there is a request that does not have a corresponding request handler.
 
 ### More
 There is much more to MSW. You can access cookies and query parameters, define mock error responses, and much more! To see all you can do with MSW, read [their documentation](https://mswjs.io/docs).