[gtk/ebassi/gidocgen: 325/500] scrollbar: Use markdown for css tree

[Emmanuele Bassi <ebassi src gnome org>]

commit d7ce5c55c834c60d9ce48d1d2ba644e2085d57cc
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 27 20:05:28 2021 -0500

    scrollbar: Use markdown for css tree

 gtk/gtkscrollbar.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkscrollbar.c b/gtk/gtkscrollbar.c
index a5c15ce90b..e52b96aeee 100644
--- a/gtk/gtkscrollbar.c
+++ b/gtk/gtkscrollbar.c
@@ -62,12 +62,12 @@
  *
  * # CSS nodes
  *
- * |[<!-- language="plain" -->
+ * ```
  * scrollbar
  * ╰── range[.fine-tune]
  *     ╰── trough
  *         ╰── slider
- * ]|
+ * ```
  *
  * `GtkScrollbar` has a main CSS node with name scrollbar and a subnode for its
  * contents. The main node gets the .horizontal or .vertical style classes applied,