A cooperative may amend its articles of incorporation to change its corporate name, to increase or reduce the number of its directors or change any other provision therein; however, no cooperative shall amend its articles of incorporation to embody therein any purpose, power or provision which would not be authorized if original articles including such additional or changed purpose, power or provision were offered for filing at the time articles under this section are offered. Such amendment may be accomplished in the method prescribed in Chapters 9 (§ 13.1-601 et seq.) and 10 (§ 13.1-801 et seq.) of Title 13.1.