headerbar: Use markdown for css tree

diff --git a/gtk/gtkheaderbar.c b/gtk/gtkheaderbar.c
index 547013f3437e1fa762d9db96ea140a0997fb0f39..dfc1b70d994ecd140fe3cc8f4a5809c6d816a80b 100644 (file)
--- 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