[doc][configuration] Change beat df to beat dataformats

The aliasing has changed: it now uses prefix aliasing.

doc/configuration.rst

@@ -31,7 +31,7 @@ configuration. By runnig for example the following command:
 
 .. code-block:: sh
 
-   $ beat df list --remote
+   $ beat dataformats list --remote
 
 
 By default, the ``beat`` application is pre-configured to access the `main BEAT