* lisp/emacs-lisp/hierarchy.el: Improve wording of package description.
similar to prefix arguments, but are more flexible and discoverable.
** hierarchy.el
-It's a library to create, query, navigate and display hierarchical
+This library can create, query, navigate and display hierarchical
structures.
---
-;;; hierarchy.el --- Library to create and display hierarchy structures -*- lexical-binding: t; -*-
+;;; hierarchy.el --- Library to create and display hierarchical structures -*- lexical-binding: t; -*-
;; Copyright (C) 2020-2021 Free Software Foundation, Inc.
;;; Commentary:
-;; Library to create, query, navigate and display hierarchy structures.
+;; Library to create, query, navigate and display hierarchical
+;; structures.
;; Creation: After having created a hierarchy with `hierarchy-new',
;; populate it by calling `hierarchy-add-tree' or