bootstrap/site/layouts/shortcodes/docsref.html

{{- $urlPath := .Get "urlPath" -}}

{{- if and (not $urlPath) (index .Params 0) -}}
  {{- $urlPath = index .Params 0 -}}
{{- end -}}

{{- $pageToReference := path.Join "docs" $.Site.Params.docs_version $urlPath -}}

{{- relref . $pageToReference | relURL -}}