Add '&' to special meaning characters for URL (#8973)

* [9.x] Consider 'Models' folder for the models path usages

* Update container.md

* Update configuration.md

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Co-authored-by: Taylor Otwell <taylor@laravel.com>

Author: majidalaeinia

configuration.md

@@ -254,7 +254,7 @@ https://example.com/1630542a-246b-4b66-afa1-dd72a4c43515
 When accessing this hidden route, you will then be redirected to the `/` route of the application. Once the cookie has been issued to your browser, you will be able to browse the application normally as if it was not in maintenance mode.
 
 > **Note**  
-> Your maintenance mode secret should typically consist of alpha-numeric characters and, optionally, dashes. You should avoid using characters that have special meaning in URLs such as `?`.
+> Your maintenance mode secret should typically consist of alpha-numeric characters and, optionally, dashes. You should avoid using characters that have special meaning in URLs such as `?` or `&`.
 
 <a name="pre-rendering-the-maintenance-mode-view"></a>
 #### Pre-Rendering The Maintenance Mode View