Document @env's parameters (#6284)

* Document @env's parameters

Corresponds to the updates in laravel/framework#33590

* Update blade.md

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

blade.md

@@ -286,7 +286,11 @@ You may check if the application is running in the production environment using
 Or, you may determine if the application is running in a specific environment using the `@env` directive:
 
     @env('staging')
-        // Staging specific content...
+        // The application is running in "staging"...
+    @endenv
+
+    @env(['staging', 'production'])
+        // The application is running in "staging" or "production"...
     @endenv
 
 <a name="switch-statements"></a>