Update docs/authoring/brand.qmd

Co-authored-by: Charlotte Wickham <[email protected]>
(cherry picked from commit 060c968)

Author: gordonwoodhull

docs/authoring/brand.qmd

@@ -181,7 +181,8 @@ Brand metadata cannot currently be specified directly in `_quarto.yml`, only via
 
 The Typst and revealjs formats do not produce outputs which can toggle between light and dark mode dynamically. 
 
-Setting `brand-mode: dark` will cause either format to render using the dark brand. 
+By default, Typst and revealjs formats will render using the light brand.
+Set `brand-mode: dark` to render using the dark brand. 
 
 Typst: