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

[Matthias Clasen <matthiasc src gnome org>]

commit 71cdb7dc146ac8827d6916151b8034f90797f981
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 27 20:05:44 2021 -0500

    searchbar: Use markdown for css tree

 gtk/gtksearchbar.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtksearchbar.c b/gtk/gtksearchbar.c
index d36e062f96..8c0685d2db 100644
--- a/gtk/gtksearchbar.c
+++ b/gtk/gtksearchbar.c
@@ -73,13 +73,13 @@
  *
  * # CSS nodes
  *
- * |[<!-- language="plain" -->
+ * ```
  * searchbar
  * ╰── revealer
  *     ╰── box
  *          ├── [child]
  *          ╰── [button.close]
- * ]|
+ * ```
  *
  * `GtkSearchBar` has a main CSS node with name searchbar. It has a child
  * node with name revealer that contains a node with name box. The box node