docs: Update a help string to reference a more up-to-date sample course.
docs: Update a help string to reference a more up-to-date sample course.

eduNEXT/edx-platform,eduNEXT/edx-platform,eduNEXT/edx-platform,angelapper/edx-platform,angelapper/edx-platform,angelapper/edx-platform,angelapper/edx-platform,eduNEXT/edx-platform