This is required to stop get_course_about_section html content from using the edxnotes version of get_html, which injects the edxnotes html into it. We don't want this injected into the html here, because these are snippets meant to be displayed in original form on the course about page.
common ------ This directory contains common code shared between LMS and CMS, such as Mako templates, CSS, and Coffescript.