The param-link is different from param in a way that it applies | markdownify to its content. So the plain-text links will be rendered as clickable <a> tags
name: The name of the configuration parameter to retrieve.
Electronic document: {{< param-link "userguidecite" >}}
^ will be rendered like Electronic document: [https://docs.qgis.org/3.34/en/docs/developers_guide/index.html](https://docs.qgis.org/3.34/en/docs/developers_guide/index.html)
Make sure that the parameter you are trying to access exists in the data/conf.json.
Also see notes about automation of LT/LTR variables in the root README