@startDocuBlock JSF_get_admin_statistics_description
@brief fetch descriptive info of statistics

@RESTHEADER{GET /_admin/statistics-description, Statistics description}

@RESTDESCRIPTION
Returns a description of the statistics returned by */_admin/statistics*.
The returned objects contains an array of statistics groups in the attribute
*groups* and an array of statistics figures in the attribute *figures*.

A statistics group is described by

- *group*: The identifier of the group.
- *name*: The name of the group.
- *description*: A description of the group.

A statistics figure is described by

- *group*: The identifier of the group to which this figure belongs.
- *identifier*: The identifier of the figure. It is unique within the group.
- *name*: The name of the figure.
- *description*: A description of the figure.
- *type*: Either *current*, *accumulated*, or *distribution*.
- *cuts*: The distribution vector.
- *units*: Units in which the figure is measured.

@RESTRETURNCODES

@RESTRETURNCODE{200}
Description was returned successfully.

@EXAMPLES

@EXAMPLE_ARANGOSH_RUN{RestAdminStatisticsDescription1}
    var url = "/_admin/statistics-description";
    var response = logCurlRequest('GET', url);

    assert(response.code === 200);

    logJsonResponse(response);
@END_EXAMPLE_ARANGOSH_RUN
@endDocuBlock