[gtk/ebassi/gidocgen] paned: Use markdown for css tree

[Matthias Clasen <matthiasc src gnome org>]

commit 917bfccc0a19e1d1cba3657ecbe236bac2d04ff3
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 27 20:03:28 2021 -0500

    paned: Use markdown for css tree

 gtk/gtkpaned.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkpaned.c b/gtk/gtkpaned.c
index 91d12f0589..f399449f96 100644
--- a/gtk/gtkpaned.c
+++ b/gtk/gtkpaned.c
@@ -76,12 +76,12 @@
  *
  * # CSS nodes
  *
- * |[<!-- language="plain" -->
+ * ```
  * paned
  * ├── <child>
  * ├── separator[.wide]
  * ╰── <child>
- * ]|
+ * ```
  *
  * `GtkPaned` has a main CSS node with name paned, and a subnode for
  * the separator with name separator. The subnode gets a .wide style