TASK: Add necessary phpdoc for extbase

As extbase does not reflect PHP source but phpdoc, we have to define the
type to use for mapping as phpdoc.

Classes/Domain/Model/SearchRequest.php

@@ -87,6 +87,9 @@ class SearchRequest implements SearchRequestInterface
         return $this->query;
     }
 
+    /**
+     * @param array $filter
+     */
     public function setFilter(array $filter)
     {
         $filter = \TYPO3\CMS\Core\Utility\ArrayUtility::removeArrayEntryByValue($filter, '');