Document that this is something edX uses for base updates.

playbooks/edx-east/common_edx_base.yml

-- name: Deploy common
+# This is a playbook that edX uses to ensure that common configuration is
+# deployed, security updates are applied, users accounts are updated on the
+# machines and our monitoring software is updated or installed.
+#
+- name: Deploy common base edX configuration
   hosts: all
   become: True
   gather_facts: True