doc improvement

playbooks/edx-east/populate_configuration_model.yml

@@ -6,7 +6,7 @@
 # code style: https://openedx.atlassian.net/wiki/display/OpenOPS/Ansible+Code+Conventions
 # license:    https://github.com/edx/configuration/blob/master/LICENSE.TXT
 #
-# Usage: ansible-playbook -i lms-host-1, -e "file=/path/to/json/file" -e "user=username"
+# Usage: ansible-playbook -i lms-host-1, ./populate_configuration_model.yml -e "file=/path/to/json/file" -e "user=username"
 #
 # Overview:
 # This executes the "populate_model" management command to populate a ConfigurationModel with