Add .. code:: directive for audio and video programs

source/2/2.5/2.5.1/K3b.rst

@@ -9,4 +9,10 @@ Lubuntu ships with version 18.04.3 of K3b.
 
 How to Launch
 -------------
-To launch K3b from the menu -> sound and video -> K3b or run K3b from the command line.
+To launch K3b from the menu -> sound and video -> K3b or run 
+
+.. code:: 
+
+   K3b 
+   
+from the command line.

source/2/2.5/2.5.2/pulseaudio_volume_control.rst

@@ -21,5 +21,11 @@ Lubuntu ships with version 0.4.0 Pulse Audio Volume Control.
 
 How to launch
 -------------
-To launch pulse audio volume Control from the menu -> Sound and video -> Pulse Audio Volume control or run pavucontrol-qt from the command line. Another way to launch Pulse audoio volume control is to click on the volume applet in the panel and click the mixer button.
+To launch pulse audio volume Control from the menu -> Sound and video -> Pulse Audio Volume control or run 
+
+.. code:: 
+
+   pavucontrol-qt 
+
+from the command line. Another way to launch Pulse audoio volume control is to click on the volume applet in the panel and click the mixer button.
 

source/2/2.5/2.5.3/vlc.rst

@@ -19,5 +19,11 @@ Lubuntu ships with version 3.0.4 of VLC.
 
 How to launch
 -------------
-to launch vlc in the menu go to Sound and video --> VLC media player or run vlc from the command line.
+to launch vlc in the menu go to Sound and video --> VLC media player or run 
+
+.. code:: 
+
+   vlc 
+   
+from the command line.