Use {% %} instead of {< >} for headings with ruby to make it work correctly in the table of contents

content/test/index.md

@@ -195,7 +195,7 @@ vulputate enim. Eget nunc lobortis mattis aliquam faucibus purus in massa. Amet
 consectetur adipiscing elit ut aliquam purus sit. Tincidunt dui ut ornare lectus
 sit amet est.
 
-## {{< ruby Japanese ja >}}日本語{{< /ruby >}}
+## {{% ruby Japanese ja %}}日本語{{% /ruby %}}
 
 Here's some text in {{< ruby Japanese ja >}}日本語{{< /ruby >}} with {{< ruby
 furigana ja >}}ふりがな{{< /ruby >}}.