fix formatting on Appendix C for command line.

source/C/command_line.rst

@@ -6,17 +6,20 @@ The command line is a different way of interfaceing with your computer that whil
 One important way to learn about the command line of each command that can be used in Lubuntu is a bit beyond the scope of the manual but to learn more about a command and all of its options run the following fi you wanted to learn more about the df or disk free command 
 
 .. code::
-  man df
+   
+   man df
 
 will show you info and explanation of the df command. One really useful option shown is for example is the -h for human readable output. so runing 
 
 .. code::
-  df -h 
+  
+   df -h 
 
 will make a much nicer output than 
 
 .. code:: 
-  df 
+   
+   df