I have a problem, someone sabotaged some pages on Wikipedia by redacting content. Is it possible to check the specific paragraph that content was changed in and restore it?
I can't understand your question. But as the title shows, you may want to edit a wiki page via API. so... this may help you:
$page = new Article(Title::newFromText('PageName'));
$status = $page->doEdit($body_text, 'message.', EDIT_UPDATE);
And if you want to revert to a prior revision of an article, you may read the docs about Rollback API of Mediawiki.