Merge pull request #8181 from IONISx/tusbar/fix-enrollment-api-doc

Fix documentation comment for enrollment API

common/djangoapps/enrollment/views.py

@@ -72,7 +72,7 @@ class EnrollmentView(APIView, ApiKeyPermissionMixIn):
 
         **Example Requests**:
 
-            GET /api/enrollment/v1/enrollment/{user_id},{course_id}
+            GET /api/enrollment/v1/enrollment/{username},{course_id}
 
         **Response Values**