Document pitfall with Mail::fake()

Author: LukeTowers

services/mail.md

@@ -480,3 +480,6 @@ Mail::assertSent('this.is.my.email', function ($mail) {
     return $mail->hasTo('test@example.com');
 });
 ```
+
+>**NOTE:** Laravel does not support rendering the mail when using the fake mailer so it is necessary to test the contents of the sent email in another way. See https://github.com/laravel/framework/issues/24005.
+