Update phpdoc.

Author: drupol

src/Exporter/Graph.php

@@ -59,13 +59,7 @@ public function getTraverser(): TraverserInterface
     }
 
     /**
-     * Export a node into a Graph.
-     *
-     * @param \drupol\phptree\Node\ValueNodeInterface $node
-     *   The node.
-     *
-     * @return \Fhaculty\Graph\Graph
-     *   The graph.
+     * {@inheritdoc}
      */
     public function export(ValueNodeInterface $node): OriginalGraph
     {

src/Exporter/Text.php

@@ -12,13 +12,7 @@
 class Text implements ExporterInterface
 {
     /**
-     * Export the node in a string.
-     *
-     * @param \drupol\phptree\Node\ValueNodeInterface $node
-     *   The node.
-     *
-     * @return string
-     *   The string.
+     * {@inheritdoc}
      */
     public function export(ValueNodeInterface $node): string
     {