[fix] compilation errors

content/dns.rst

@@ -1,4 +1,4 @@
-#
+###
 dns
 ###
 

content/mailman.rst

@@ -74,6 +74,7 @@ As I already had a mailman instance, I just had to do the following to create a
 virtual environment.
 
 .. code-block:: bash
+
    cd /opt/mailman
    chown -R mailman:mailman .
    su mailman
@@ -84,6 +85,7 @@ virtual environment.
 Check if the version of pip you use is really the one of the virtual env :
 
 .. code-block:: bash
+
    (venv) {13:24} mail:/opt/mailman$ which pip
    /opt/mailman/venv/bin/pip
 
@@ -181,6 +183,7 @@ I'll modify the mailman init to point to the one in the virtual environment.
 Modify mailman.cfg according to new configuration (path.fhs.bin_dir)
 
 .. code-block:: ini
+
    [mailman]
    layout: fhs
    site_owner: root@freepoteries.fr