code: public Result<Void> addDescription(AuthzTrans trans, String ns, String type,
  			String instance, String action, String description) {
  		try {
  			getSession(trans).execute(UPDATE_SP + TABLE + " SET description = '" 
  				+ description + "' WHERE ns = '" + ns + "' AND type = '" + type + "'"
  				+ "AND instance = '" + instance + "' AND action = '" + action + "';");
  		} catch (DriverException | APIException | IOException e) {
  			reportPerhapsReset(trans,e);
  			return Result.err(Result.ERR_Backend, CassAccess.ERR_ACCESS_MSG);
  		}
  
  		Data data = new Data();
  		data.ns=ns;
  		data.type=type;
  		data.instance=instance;
  		data.action=action;
  		wasModified(trans, CRUD.update, data, "Added description " + description + " to permission " 
  				+ data.encode(), null );
  		return Result.ok();
  	}
docs: Add description to this permission
  
  @param trans
  @param ns
  @param type
  @param instance
  @param action
  @param description
  @return