code: public static DocTreePath getPath(TreePath treePath, DocCommentTree doc, DocTree target) {
          return getPath(new DocTreePath(treePath, doc), target);
      }
docs: Returns a documentation tree path for a tree node within a compilation unit,
  or {@code null} if the node is not found.
  @param treePath the path for the node with which the doc comment is associated
  @param doc the doc comment associated with the node
  @param target a node within the doc comment
  @return a path identifying the target within the tree