Use scalar type hint instead of docblock

Author: schmengler

lib/internal/Magento/Framework/Model/ResourceModel/ResourceModelPool.php

@@ -23,7 +23,7 @@ public function __construct(ObjectManagerInterface $objectManager)
         $this->objectManager = $objectManager;
     }
 
-    public function get($resourceClassName): AbstractResource
+    public function get(string $resourceClassName): AbstractResource
     {
         return $this->objectManager->get($resourceClassName);
     }

lib/internal/Magento/Framework/Model/ResourceModel/ResourceModelPoolInterface.php

@@ -15,9 +15,6 @@ interface ResourceModelPoolInterface
 {
     /**
      * Return instance for given class name from pool
-     *
-     * @param string $resourceClassName
-     * @return AbstractResource
      */
-    public function get($resourceClassName): AbstractResource;
+    public function get(string $resourceClassName): AbstractResource;
 }