Add missing library commentaries

Author: tarsius

lisp/epkg-desc.el

@@ -24,6 +24,11 @@
 ;; This file contains code taken from GNU Emacs, which is
 ;; Copyright (C) 1976-2023 Free Software Foundation, Inc.
 
+;;; Commentary:
+
+;; The library implements support for showing information about
+;; a package in a buffer.
+
 ;;; Code:
 
 (require 'epkg)

lisp/epkg-list.el

@@ -24,6 +24,10 @@
 ;; This file contains code taken from GNU Emacs, which is
 ;; Copyright (C) 1976-2023 Free Software Foundation, Inc.
 
+;;; Commentary:
+
+;; The library implements support for listing packages in a buffer.
+
 ;;; Code:
 
 (require 'epkg)

lisp/epkg-utils.el

@@ -21,6 +21,10 @@
 ;; You should have received a copy of the GNU General Public License
 ;; along with this file.  If not, see <https://www.gnu.org/licenses/>.
 
+;;; Commentary:
+
+;; The library implements auxiliary functions and commands.
+
 ;;; Code:
 
 (require 'epkg)