#24153: Static tests fix.

Author: engcom-Foxtrot

app/code/Magento/Config/Model/Config/Backend/File/Pdf.php

@@ -4,15 +4,17 @@
  * See COPYING.txt for license details.
  */
 
-namespace Magento\Config\Model\Config\Backend\Image;
+namespace Magento\Config\Model\Config\Backend\File;
 
 /**
+ * System config PDF field backend model.
+ *
  * @api
  */
 class Pdf extends \Magento\Config\Model\Config\Backend\File
 {
     /**
-     * @return string[]
+     * @inheritdoc
      */
     protected function _getAllowedExtensions()
     {

app/code/Magento/Config/Model/Config/Backend/Image/Pdf.php

@@ -7,14 +7,16 @@
 namespace Magento\Config\Model\Config\Backend\Image;
 
 /**
+ * System config PDF field backend model.
+ *
  * @api
  * @deprecated The wrong file type extensions are returned.
  * @see \Magento\Config\Model\Config\Backend\File\Pdf
  */
 class Pdf extends \Magento\Config\Model\Config\Backend\Image
 {
     /**
-     * @return string[]
+     * @inheritdoc
      */
     protected function _getAllowedExtensions()
     {