Merge pull request twbs#13081 from ZDroid/blank

Add missing blank line

Author: mdo

docs/sitemap.xml

@@ -1,6 +1,7 @@
 ---
 layout: nil
 ---
+
 <?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url>