updating comments for edx_sandbox

playbooks/edx_sandbox.yml

 # This playbook is to configuration
 # the official edX sandbox instance
 # sandbox.edx.org
-
+#
+# On the machine you want to configure run the following
+# command from the configuration/playbooks directory:
+#   ansible-playbook -c local --limit "localhost:127.0.0.1" /path/to/configuration/playbooks/edx_sandbox.yml -i "localhost,"
+# 
+# To use different default ports for lms-preview, cms and to set the lms_base and lms_preview_base,
+# for the following configuration:
+#   studio listening on port 80 - studio.example.com
+#   lms listening on port 80 - example.com
+#   lms-preview listening on port 80 - preview.example.com
+#
+#   ansible-playbook -c local --limit "localhost:127.0.0.1" /var/tmp/configuration/playbooks/edx_sandbox.yml -i "localhost," -e "cms_nginx_port=80 lms_preview_nginx_port=80 lms_base=example.com  preview_lms_base=preview.example.com"
+#
 - name: Configure instance(s)
   hosts: localhost
   sudo: True