(a) A corporation may amend its articles from time to time, in any and as many respects as may be desired, so long as its articles as amended contain only such provisions as it would be lawful to insert in original articles filed at the time of the filing of the amendment and, if a change in shares or the rights of shareholders or an exchange, reclassification or cancellation of shares or rights of shareholders is to be made, such provisions as may be necessary to effect such change, exchange, reclassification or cancellation. It is the intent of the Legislature in adopting this section to exercise to the fullest extent the reserve power of the state over corporations and to authorize any amendment of the articles covered by the preceding sentence regardless of whether any provision contained in the amendment was permissible at the time of the original incorporation of the corporation.