radicale: Update link to documentation
radicale: Update link to documentation

Reviewed-by: Sunil Mohan Adapa <3eaa7035e78e5eca849aa1e8ea4aaf97b4588601@medhas.org>

harry-7/Plinth,kkampardi/Plinth,vignanl/Plinth,kkampardi/Plinth,harry-7/Plinth,vignanl/Plinth,harry-7/Plinth,vignanl/Plinth,vignanl/Plinth,harry-7/Plinth,kkampardi/Plinth,kkampardi/Plinth,harry-7/Plinth,kkampardi/Plinth,vignanl/Plinth