Fix the error that is wrong link title of a downloadable product when enabling "Use Default Value"

- Fix static code

Author: tna274

app/code/Magento/Downloadable/Model/Link/Builder.php

@@ -13,6 +13,8 @@
 
 /**
  * Class Builder
+ *
+ * @package Magento\Downloadable\Model\Link
  * @api
  * @since 100.1.0
  */
@@ -134,7 +136,7 @@ public function build(\Magento\Downloadable\Api\Data\LinkInterface $link)
         }
 
         $useDefaultTitle = $this->data['use_default_title'] ?? false;
-        
+
         if ($useDefaultTitle) {
             $link->setTitle(null);
         }

app/code/Magento/Downloadable/Model/Sample/Builder.php

@@ -15,6 +15,8 @@
 
 /**
  * Class Builder
+ *
+ * @package Magento\Downloadable\Model\Sample
  * @api
  * @since 100.1.0
  */
@@ -71,6 +73,8 @@ public function __construct(
     }
 
     /**
+     * Init data for builder
+     *
      * @param array $data
      * @return $this;
      * @since 100.1.0
@@ -82,6 +86,8 @@ public function setData(array $data)
     }
 
     /**
+     * Build sample link
+     *
      * @param SampleInterface $sample
      * @return SampleInterface
      * @throws \Magento\Framework\Exception\LocalizedException
@@ -122,6 +128,8 @@ public function build(SampleInterface $sample)
     }
 
     /**
+     * Reset data
+     *
      * @return void
      */
     private function resetData()
@@ -130,6 +138,8 @@ private function resetData()
     }
 
     /**
+     * Get component
+     *
      * @return Sample
      */
     private function getComponent()

app/code/Magento/Downloadable/Test/Unit/Model/Link/BuilderTest.php

@@ -12,6 +12,8 @@
 
 /**
  * Class BuilderTest
+ *
+ * @package Magento\Downloadable\Test\Unit\Model\Link
  */
 class BuilderTest extends \PHPUnit\Framework\TestCase
 {

app/code/Magento/Downloadable/Test/Unit/Model/Sample/BuilderTest.php

@@ -12,6 +12,8 @@
 
 /**
  * Class BuilderTest
+ *
+ * @package Magento\Downloadable\Test\Unit\Model\Sample
  */
 class BuilderTest extends \PHPUnit\Framework\TestCase
 {