code: func (h *Handler) deleteSession(w http.ResponseWriter, r *http.Request, _ httprouter.Params, ctx *SessionContext) (interface{}, error) {
  	err := h.logout(w, ctx)
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  
  	return ok(), nil
  }
docs: // deleteSession is called to sign out user
  //
  // DELETE /v1/webapi/sessions/:sid
  //
  // Response:
  //
  // {"message": "ok"}
  //