Enhance docs for run. Reviewed in https://codereview.appspot.com/6753051/.
Enhance docs for run.
Reviewed in https://codereview.appspot.com/6753051/.

jonparrott/oauth2client,googleapis/oauth2client,google/oauth2client,jonparrott/oauth2client,googleapis/google-api-python-client,google/oauth2client,clancychilds/oauth2client,clancychilds/oauth2client,googleapis/oauth2client,googleapis/google-api-python-client