In the middle supplemental element, include the label “Updated by” and the name of the person (or names of the people) who updated the post:
Roy, Patricia E. “Vancouver.” Updated by Nathan Coschi And Leanna Fong. The Canadian Encyclopedia, Historica Canada, 16 Dec. 2022, thecanadianencyclopedia.ca/en/article/vancouver.
The information is included in the middle supplemental element, rather than the Contributor element, because only the article—not the entire website—was updated by those people. For more more information about using the middle supplemental element for contributor information, see section 5.107 of the ninth edition of the MLA Handbook.
Work Cited
MLA Handbook. 9th ed., Modern Language Association of America, 2021.