Adds explanation for sp_entity_id variable

Author: ricardovdheijden

roles/myconext/templates/application.yml.j2

@@ -97,6 +97,7 @@ account_origin: https://login.{{ myconext_base_domain }}
 myconext_entityid: https://mijn.{{ myconext_base_domain }}
 myconext_redirect_url: https://mijn.{{ myconext_base_domain }}
 servicedesk_redirect_url: https://servicedesk.{{ myconext_base_domain }}
+# sp_entity_id represents the SP's that are allowed to connect -- It is a comma separated list
 sp_entity_id: {{ myconext.sp_entity_id }}
 account_metadata_url: {{ myconext.sp_entity_metadata_url }}
 proxy_idp_entity_id: https://engine.{{ base_domain }}/authentication/idp/metadata