(a) A special-law municipality that was incorporated as a town or village before June 30, 1881, by the Congress of the Republic of Texas or by the legislature may amend its charter in any regard that does not conflict with the law of this state if the amendment is approved by a resolution of the governing body of the town or village and by at least a two-thirds vote at an election held to ratify the amendment.
(b) An amendment to a charter under Subsection (a) is not effective until:
(1) the governing body of the town or village adopts a resolution stating the amendment; and
(2) a certified copy of the amendment is approved by the attorney general and recorded with the secretary of state.