Reflect the clearsessions change in Django

doc/getting_started/configuration.rst

@@ -343,7 +343,7 @@ whose ``expire_date`` is in the past.
 
 For example, you could setup a cron job to run this script every night::
 
-  0 0 * * * <modoboa_site>/manage.py cleanup
+  0 0 * * * <modoboa_site>/manage.py clearsessions
   #
   # Or like this if you use a virtual environment:
   # 0 0 * * * <virtualenv path/bin/python> <modoboa_site>/manage.py clearsessions

doc/getting_started/upgrade.rst

@@ -112,6 +112,11 @@ Here are the required steps:
    $ python manage.py load_initial_data
    $ python manage.py collectstatic
 
+#. The cleanup job has been renamed in Django, so you have to modify your crontab entry::
+
+   - 0 0 * * * <modoboa_site>/manage.py cleanup
+   + 0 0 * * * <modoboa_site>/manage.py clearsessions
+
 1.2.0
 =====