DOC: Update docstring
DOC: Update docstring

- Rename Usage -> Examples to match numpydoc spec
- Changes reflect desire to be more specific about variable names
- Update order of Parameters section to match the RunStart object
  in metadatastore/odm_templates.py
- Add uid/_id fields

ericdill/databroker,tacaswell/metadataStore,hhslepicka/metadatastore,NSLS-II/metadatastore,ericdill/databroker,arkilic/metadatastore,tacaswell/metadataStore,NSLS-II/metadatastore,arkilic/metadatastore,hhslepicka/metadatastore