WIP: Error fixing

line 7 in this file still gives this error for a make html:
                                                                                                                                                                                       
/Users/alisonhodges/edx-documentation/en_us/course_authors/source/content_experiments/content_experiments_add.rst:7: WARNING: undefined label: set up group configurations in an xml course (if the link has no caption the label must precede a section header)