frontend: insert a line break after Example output
This fixes a rendering issue when the Example output code block
directly abuts a following code block, such as a var block.
Fixes
@@ -223,6 +223,7 @@ var htmlPackage = template.Must(template.New("package").Funcs(
<pre>{{"\n"}}{{.Output}}</pre>{{"\n" -}}
{{- end -}}
</div>{{"\n" -}}
+ <br/>{{"\n" -}}
</details>{{"\n" -}}
{{"\n"}}
{{- end -}}
