[gtk/ebassi/gidocgen: 294/478] headerbar: Use markdown for css tree

[Emmanuele Bassi <ebassi src gnome org>]

commit ad6881173fad221fe258ea81b1c96107ba84ca3d
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 27 19:47:32 2021 -0500

    headerbar: Use markdown for css tree

 gtk/gtkheaderbar.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkheaderbar.c b/gtk/gtkheaderbar.c
index 547013f343..dfc1b70d99 100644
--- a/gtk/gtkheaderbar.c
+++ b/gtk/gtkheaderbar.c
@@ -87,7 +87,7 @@
  *
  * # CSS nodes
  *
- * |[<!-- language="plain" -->
+ * ```
  * headerbar
  * ╰── windowhandle
  *     ╰── box
@@ -98,7 +98,7 @@
  *         ╰── box.end
  *             ├── [other children]
  *             ╰── windowcontrols.end
- * ]|
+ * ```
  *
  * A `GtkHeaderBar`'s CSS node is called `headerbar`. It contains a `windowhandle`
  * subnode, which contains a `box` subnode, which contains two `box` subnodes at