[BUGFIX] Fix the feed validation

Resources/Private/Templates/NewsFeed/Index.html

@@ -13,7 +13,7 @@
 		<entry>
 			<title>{singleNews.subtitleWithFallbackToTitle}</title>
 			<link href="{f:uri.page(pageUid: '{singleNews.uid}')}" />
-			<id>{singleNews.uid}</id>
+			<id>{f:uri.page(pageUid: '{singleNews.uid}')}</id>
 			<updated>{singleNews.lastUpdated -> f:format.date(format: "Y-m-d\TH:i:s+01:00")}</updated>
 			<summary type="html">{singleNews.description}</summary>
 		</entry>