Section 32A. The provisions in the charter of a city which accepts this section by vote of its city council, requiring newspaper advertising of certain ordinances and proposed ordinances shall, in case of any ordinance or proposed ordinance, or codification thereof, exceeding in length eight octavo pages of ordinary book print, be deemed to be complied with if the same is published by the city council in a municipal bulletin or printed pamphlet, but otherwise in conformity with said provisions, except for zoning ordinances or amendments thereto, a summary of which shall be published at least two times in a newspaper of general circulation in the city. The publication of such zoning summaries shall include a statement indicating where copies of the ordinance may be examined and obtained and a statement that claims of invalidity by reason of any defect in the procedure of adoption may only be made within ninety days after the posting or the second publication.