"Articles of Amendment" may well go better with "Articles of Incorporation" and the English version of that can vary, for instance you mention "memorandum of association", another variant, but no destination is mentioned. Use what fits your destination.

However, so far I have found no basis for the use of the word "deed" that so many wish to use as a generic equivalent for "escritura". As far as I have been able to determine, it is only applicable to real property deeds and to no other type of document.