docs: add note for change Authorization to PersonalAccessCodes

Author: datamweb

docs/guides/mobile_apps.md

@@ -58,3 +58,9 @@ class LoginController extends BaseController
 ```
 
 When making all future requests to the API, the mobile client should return the raw token in the `Authorization` header as a `Bearer` token.
+
+> **Note**
+>
+> By default, `$authenticatorHeader['tokens']` is set to `Authorization`. You can change this value by setting the `$authenticatorHeader['tokens']` value in the `Auth.php` config file.
+>
+> e.g. if `$authenticatorHeader['tokens']` is set to `PersonalAccessCodes`. the mobile client should return the raw token in the `PersonalAccessCodes` header as a `Bearer` token.