[gtk/ebassi/gidocgen: 317/501] fontbutton: Use markdown for css tree

[Emmanuele Bassi <ebassi src gnome org>]

commit 18dc4284aed1e8d7e74b7ed6467158d02021dbed
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 27 19:46:58 2021 -0500

    fontbutton: Use markdown for css tree

 gtk/gtkfontbutton.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkfontbutton.c b/gtk/gtkfontbutton.c
index 4dd63c107c..091ecbfe19 100644
--- a/gtk/gtkfontbutton.c
+++ b/gtk/gtkfontbutton.c
@@ -59,11 +59,11 @@
  *
  * # CSS nodes
  *
- * |[<!-- language="plain" -->
+ * ```
  * fontbutton
  * ╰── button.font
  *     ╰── [content]
- *]|
+ * ```
  *
  * `GtkFontButton` has a single CSS node with name fontbutton which
  * contains a button node with the .font style class.