MAGETWO-67718: @api coverage integrity test

- removed unnecessary @api

Author: buskamuza

app/code/Magento/CatalogRule/Model/Rule.php

@@ -14,7 +14,6 @@
 /**
  * Catalog Rule data model
  *
- * @api
  * @method \Magento\CatalogRule\Model\ResourceModel\Rule _getResource()
  * @method \Magento\CatalogRule\Model\ResourceModel\Rule getResource()
  * @method \Magento\CatalogRule\Model\Rule setFromDate(string $value)

dev/tests/static/testsuite/Magento/Test/Integrity/PublicCodeTest.php

@@ -35,9 +35,7 @@ public function testAllBlocksReferencedInLayoutArePublic($layoutFile)
         $xml = simplexml_load_file($layoutFile);
         $elements = $xml->xpath('//block | //referenceBlock') ?: [];
         /** @var $node \SimpleXMLElement */
-        $counter = 0;
         foreach ($elements as $node) {
-            $counter++;
             $class = (string) $node['class'];
             if ($class && \class_exists($class)) {
                 $reflection = (new \ReflectionClass($class));