global: update of example documentation
global: update of example documentation

* Updates documentation of accounts cli usage.
  (addresses inveniosoftware/invenio-accounts#90)

Signed-off-by: Leonardo Rossi <5460ec99b71a72e7693c4088b5c2585e76e1c857@cern.ch>

inveniosoftware/invenio-search,inveniosoftware/invenio-search,tiborsimko/invenio-search,tiborsimko/invenio-search