Add “;;; Commentary:” labels

pw-access.el

@@ -17,6 +17,8 @@
 ;; You should have received a copy of the GNU General Public License
 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+;;; Commentary:
+;;
 ;; A generic interface for communication with PipeWire (https://pipewire.org).
 ;; It abstracts communication with PipeWire to be backend independent.
 ;; Only functions from this module may communicate with PipeWire.

pw-lib.el

@@ -17,6 +17,8 @@
 ;; You should have received a copy of the GNU General Public License
 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+;;; Commentary:
+;;
 ;; Backend-independent library to access PipeWire functionality.
 ;; It abstracts data returned from `pw-access' methods and provides
 ;; functions to work with them.

pw-ui.el

@@ -17,6 +17,8 @@
 ;; You should have received a copy of the GNU General Public License
 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+;;; Commentary:
+;;
 ;; PipeWire user interface based on pw-lib.
 ;; An interactive buffer can be displayed using `M-x pipewire'.
 ;; `pipewire-increase-volume', `pipewire-decrease-volume' and