(a) After the board authorizes bonds to be issued, the board may make changes in the district or its improvements which will be an advantage to the district but which will not increase the cost of the proposed work beyond the amount of bonds authorized.
(b) The board may make the changes by entering on their minutes a notation of the changes, with the district maps and profiles showing the changes. Notice of the changes shall be given by publishing the notation with the book and page number of the minutes for two consecutive weeks in a newspaper of general circulation published in the English language in the county in which the district is located.