Update data_dictionary.md
Update data_dictionary.md
Mardak/activity-stream,JaredKerim-Mozilla/activity-stream,mozilla/activity-streams,rlr/activity-streams,Mardak/activity-stream,mozilla/activity-stream,sarracini/activity-stream,Mardak/activity-stream,sarracini/activity-stream,mozilla/activity-streams,AdamHillier/activity-stream,mozilla/activity-stream,AdamHillier/activity-stream,JaredKerim-Mozilla/activity-stream,sarracini/activity-stream,dan-l/activity-stream,Mardak/activity-stream,JaredKerim-Mozilla/activity-stream,sarracini/activity-stream,JaredKerim-Mozilla/activity-stream,rlr/activity-streams,dan-l/activity-stream,rlr/activity-streams,mozilla/activity-stream,rlr/activity-streams,dan-l/activity-stream,AdamHillier/activity-stream,AdamHillier/activity-stream,mozilla/activity-stream