Implemented the review comments

Author: Indraniks

app/code/Magento/Catalog/Helper/Product/View.php

@@ -302,7 +302,7 @@ public function prepareAndRender(ResultPage $resultPage, $productId, $controller
      * @param string $title
      * @return string
      */
-    private function addConfigValues($title)
+    private function addConfigValues($title): string
     {
         $preparedTitle = $this->scopeConfig->getValue(
             'design/head/title_prefix',

app/code/Magento/ConfigurableProduct/Model/LinkManagement.php

@@ -52,7 +52,7 @@ class LinkManagement implements \Magento\ConfigurableProduct\Api\LinkManagementI
     /**
      * @var ProductRepository|mixed
      */
-    public \Magento\Catalog\Model\ProductRepository $mediaGallery;
+    private \Magento\Catalog\Model\ProductRepository $mediaGallery;
 
     /**
      * @var ProductAttributeMediaGalleryEntryInterfaceFactory|mixed
@@ -136,7 +136,7 @@ public function getChildren($sku)
      * @param array $images
      * @return array
      */
-    public function getMediaEntries($images)
+    public function getMediaEntries($images): array
     {
         $media = $this->myModelFactory->create();
         $mediaGalleryEntries=[];