Change default configuration to be more compatible with stock migrations.

Author: stevebauman

src/Config/auth.php

@@ -26,17 +26,15 @@
     | attribute to discover the user by. The reason for this is to hide
     | the attribute that you're using to login users.
     |
-    | For example, if your input name is `username` and you'd like users
-    | to login by their `samaccountname` attribute, then keep the
     | configuration below. However, if you'd like to login users
-    | by their emails, then change `samaccountname` to `mail`.
-    | and `username` to `email`.
+    | by their usernames, then change `mail` to `samaccountname`.
+    | and `email` to `username`.
     |
     | This must be an array with a key - value pair.
     |
     */
 
-    'username_attribute' => ['username' => 'samaccountname'],
+    'username_attribute' => ['email' => 'mail'],
 
     /*
     |--------------------------------------------------------------------------