[Transform] Fix example config on FuncCallToNewRector (#7196)

Author: samsonasik

rules/Transform/Rector/FuncCall/FuncCallToNewRector.php

@@ -49,7 +49,7 @@ public function run()
 CODE_SAMPLE
                 ,
                 [
-                    'collection' => ['Collection'],
+                    'collection' => 'Collection',
                 ]
             ),
         ]);