chore: add author

Added author information for the tabset fragments feature in Reveal.js presentations.

Author: mcanouil

news/changelog-1.9.md

@@ -50,7 +50,7 @@ All changes included in 1.9:
 
 ### `revealjs`
 
-- ([#13712](https://github.com/quarto-dev/quarto-cli/issues/13712)): Add support for tabset fragments in Reveal.js presentations, allowing content within tabs to be revealed incrementally during presentations.
+- ([#13712](https://github.com/quarto-dev/quarto-cli/issues/13712)): Add support for tabset fragments in Reveal.js presentations, allowing content within tabs to be revealed incrementally during presentations. (author: @mcanouil)
 
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