docs: Fix mount shell block

docs/chapters/subcommands/mount.rst

@@ -12,12 +12,16 @@ Syntax follows standard ``/etc/fstab`` format:
 The ``options`` string can include a comma-separated list of mount options, but must include one of (rw,ro,rq,sw,xx) according to fstab documentation.
 
 Example: Mount a tmpfs filesystem with options.
+
 .. code-block:: shell
+
   ishmael ~ # bastille mount azkaban tmpfs tmp tmpfs rw,nosuid,mode=01777 0 0
   Detected advanced mount type tmpfs
   [azkaban]:
   Added: tmpfs /usr/local/bastille/jails/azkaban/root/tmp tmpfs rw,nosuid,mode=01777 0 0
 
+Example: Mount a nullfs filesystem
+
 .. code-block:: shell
 
   ishmael ~ # bastille mount azkaban /storage/foo media/foo nullfs ro 0 0
@@ -59,4 +63,4 @@ It is possible to do the same for the jail path, but again, not recommemded.
     Options:
 
     -a | --auto           Auto mode. Start/stop jail(s) if required.
-    -x | --debug          Enable debug mode.
+    -x | --debug          Enable debug mode.