amend touched DocBlocks

Author: david-fuehr

app/code/Magento/Robots/Model/Config/Value.php

@@ -32,9 +32,8 @@ class Value extends ConfigValue implements IdentityInterface
     const CACHE_TAG = 'robots';
 
     /**
-     * Model cache tag for clear cache in after save and after delete
+     * @inheritdoc
      *
-     * @var string
      * @since 100.2.0
      */
     protected $_cacheTag = [self::CACHE_TAG];

app/code/Magento/Sitemap/Model/Sitemap.php

@@ -154,9 +154,8 @@ class Sitemap extends \Magento\Framework\Model\AbstractModel implements \Magento
     protected $dateTime;
 
     /**
-     * Model cache tag for clear cache in after save and after delete
+     * @inheritdoc
      *
-     * @var string
      * @since 100.2.0
      */
     protected $_cacheTag = [Value::CACHE_TAG];