fixed phpdocs

src/NodeTraverser.php

@@ -58,7 +58,7 @@ final class NodeTraverser
     }
 
     /**
-     * @return Node|false
+     * @return Node|null
      */
     private function traverseForVisitor(NodeVisitorInterface $visitor, Node $node)
     {

src/NodeVisitor/AbstractNodeVisitor.php

@@ -43,7 +43,7 @@ abstract class AbstractNodeVisitor implements NodeVisitorInterface
     /**
      * Called after child nodes are visited.
      *
-     * @return Node|false|null The modified node or null if the node must be removed
+     * @return Node|null The modified node or null if the node must be removed
      */
     abstract protected function doLeaveNode(Node $node, Environment $env);
 }

src/NodeVisitor/NodeVisitorInterface.php

@@ -31,7 +31,7 @@ interface NodeVisitorInterface
     /**
      * Called after child nodes are visited.
      *
-     * @return Node|false|null The modified node or null if the node must be removed
+     * @return Node|null The modified node or null if the node must be removed
      */
     public function leaveNode(Node $node, Environment $env);