ENGCOM-3399: Static tests fixed.

Author: p-bystritsky

app/code/Magento/Catalog/Model/ResourceModel/Product/CategoryLink.php

@@ -93,6 +93,8 @@ public function saveCategoryLinks(ProductInterface $product, array $categoryLink
     }
 
     /**
+     * Get category link metadata.
+     *
      * @return \Magento\Framework\EntityManager\EntityMetadataInterface
      */
     private function getCategoryLinkMetadata()
@@ -136,6 +138,8 @@ private function processCategoryLinks($newCategoryPositions, &$oldCategoryPositi
     }
 
     /**
+     * Update category links by product.
+     *
      * @param ProductInterface $product
      * @param array $insertLinks
      * @param bool $insert
@@ -179,6 +183,8 @@ private function updateCategoryLinks(ProductInterface $product, array $insertLin
     }
 
     /**
+     * Delete category links by product.
+     *
      * @param ProductInterface $product
      * @param array $deleteLinks
      * @return array