small update to see if that get the GitHub Action to run again

Author: jasdumas

preface.qmd

@@ -38,8 +38,8 @@ The CRAN Cookbook has been developed as part of a special project grant from the
 
 _Thanks to all contributors!_
 
-Lluís Revilla ([@llrs](https://github.com/llrs))\
-Ivan Krylov ([@aitap](https://github.com/aitap))
+- Lluís Revilla ([@llrs](https://github.com/llrs))\
+- Ivan Krylov ([@aitap](https://github.com/aitap))
 
 # Colophon