proper mdwn style code indentation

docs/web/cdist/install.mdwn

@@ -45,18 +45,18 @@ For Debian **wheezy** or newer:
 
 On **squeeze** you can add following line in **/etc/apt/sources.list**
 
-  deb http://ftp.debian.org/debian wheezy main
+    deb http://ftp.debian.org/debian wheezy main
 
 And add pinning entry in **/etc/apt/preferences.d/wheezy**:
 
-  Package: *
-  Pin: release n=wheezy
-  Pin-Priority: 1
+    Package: *
+    Pin: release n=wheezy
+    Pin-Priority: 1
 
 Please be aware that both **openssh-server** and **openssh-client** might be
 removed on **python3.2** installation. You surely want to reinstall them:
 
-  apt-get install -t wheezy openssh-server openssh-client
+    apt-get install -t wheezy openssh-server openssh-client
 
 For older Debian versions, installing python 3.2 from source is required.