put back end of file newline

(cherry picked from commit 8b83b5a)

Author: cderv

docs/extensions/listings/shortcodes-and-filters.yml

@@ -601,4 +601,4 @@
 - name: wordcount
   path: https://github.com/andrewheiss/quarto-wordcount
   author: '[Andrew Heiss](https://github.com/andrewheiss/)'
-  description: Quarto extension for calculating accurate word counts
+  description: Quarto extension for calculating accurate word counts