[docs] Fix site_url - take 2

docs/_includes/section-fast-and-scalable.html

@@ -8,4 +8,4 @@
     Writing an ODS file with millions of rows? {{ site.spout_html }} can do it in no time!
 {% endcapture %}
 
-{% include section.html %}
+{% include section.html site_url = include.site_url %}