Merge pull request #8062 from edx/ahsan/AC-108-no-role-inside-courseware-lms

No role inside of courseware

lms/templates/courseware/courseware.html

@@ -176,7 +176,7 @@ ${fragment.foot_html()}
       </div>
     </div>
 % endif
-    <section class="course-content" id="course-content">
+    <section class="course-content" id="course-content" role="main" aria-label=“Content”>
         % if getattr(course, 'entrance_exam_enabled') and \
            getattr(course, 'entrance_exam_minimum_score_pct') and \
            entrance_exam_current_score is not UNDEFINED: