Fix return type Result::getFacetSet() (#591)

Fix return type Result::getFacetSet()

src/QueryType/Select/Result/Result.php

@@ -3,8 +3,8 @@
 namespace Solarium\QueryType\Select\Result;
 
 use Solarium\Component\ComponentAwareQueryInterface;
+use Solarium\Component\FacetSet;
 use Solarium\Component\Result\Debug\Result as DebugResult;
-use Solarium\Component\Result\Facet\Field;
 use Solarium\Component\Result\Grouping\Result as GroupingResult;
 use Solarium\Component\Result\Highlighting\Highlighting;
 use Solarium\Component\Result\MoreLikeThis\Result as MoreLikeThisResult;
@@ -272,7 +272,7 @@ class Result extends BaseResult implements \IteratorAggregate, \Countable
      *
      * This is a convenience method that maps presets to getComponent
      *
-     * @return Field[]|null
+     * @return FacetSet|null
      */
     public function getFacetSet()
     {