install coding block

sympa/install.md

@@ -21,7 +21,7 @@ USE OF: postfix + postgresql + apache2 + fcgi
 * a2enmod rewrite proxy_fcgi
 * vim /etc/apache2/sites-available/sympa.conf
   ```
-<VirtualHost *:80>
+  <VirtualHost *:80>
       ServerName localhost
       RewriteEngine On
       RewriteRule ^/$ /wws [R]
@@ -29,8 +29,8 @@ USE OF: postfix + postgresql + apache2 + fcgi
           SetHandler "proxy:unix:/run/sympa/wwsympa.socket|fcgi://localhost"
           Require all granted
       </Location>
-</VirtualHost>
+  </VirtualHost>
   ```
-  * a2dissite 000-default.conf
-  * a2ensite sympa.conf
-  * systemctl restart apache2 sympa
+* a2dissite 000-default.conf
+* a2ensite sympa.conf
+* systemctl restart apache2 sympa