update comments

Author: sarahs

lib/page-data.js

@@ -43,7 +43,7 @@ module.exports = async function loadPageData () {
     const treePerVersion = {}
 
     await Promise.all(versions.map(async (version) => {
-      // Yes, we are mutating the rawTree object here.
+      // Yes, we are mutating the rawTree object here...
       versionPages(rawTree[langCode])
 
       // This step can't be asynchronous because the order of child pages matters.
@@ -58,8 +58,10 @@ module.exports = async function loadPageData () {
 
         if (!item.childPages) return item
 
-        // Drop child pages that do not apply to the current version
+        // Drop child pages that do not apply to the current version.
         item.childPages = item.childPages.filter(childPage => childPage.page.applicableVersions.includes(version))
+
+        // Run on the child pages recursively.
         item.childPages.forEach(childPage => versionPages(childPage))
       }