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This task is about MediaWiki's PageImages extension.

Currently this option is documented as: "integer -> Maximum thumbnail dimension"

The term "dimension" is confusing here, and it does not explain that the width is in pixels.

This task requires to fix the documentation both on https://www.mediawiki.org/wiki/Extension:PageImages (by editing that wiki page) and in https://www.mediawiki.org/w/api.php?action=help&modules=query%2Bpageimages (by fixing the output provided by the extension's API).

For the latter, you are expected to provide a patch in Wikimedia Gerrit. See https://www.mediawiki.org/wiki/Gerrit/Tutorial for how to set up Git and Gerrit.