fix typo

Author: sarahs

lib/site-tree.js

@@ -134,7 +134,7 @@ function buildMaptopicsTree (tocItems, versionedCategoryHref, pageMap, redirects
       // make the child articles accessible to the page object for maptopic rendering
       if (!page.childArticles) page.childArticles = childArticles
 
-      maptopic.articles = buildArticlesTree(maptopic.childArticles, versionedCategoryHref, pageMap, redirects, version, languageCode)
+      maptopic.articles = buildArticlesTree(page.childArticles, versionedCategoryHref, pageMap, redirects, version, languageCode)
       maptopicTree[versionedMaptopicHref] = maptopic
     })