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

[Matthias Clasen <matthiasc src gnome org>]

commit 6a568eb070af70eefeef3ca5c14b1dd507458533
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 27 20:06:56 2021 -0500

    textview: Use markdown for css tree

 gtk/gtktextview.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtktextview.c b/gtk/gtktextview.c
index 79cd7aaa6b..d8e1cefaa0 100644
--- a/gtk/gtktextview.c
+++ b/gtk/gtktextview.c
@@ -70,7 +70,7 @@
  *
  * ## CSS nodes
  *
- * |[<!-- language="plain" -->
+ * ```
  * textview.view
  * ├── border.top
  * ├── border.left
@@ -79,7 +79,7 @@
  * ├── border.right
  * ├── border.bottom
  * ╰── [window.popup]
- * ]|
+ * ```
  *
  * `GtkTextView` has a main css node with name textview and style class .view,
  * and subnodes for each of the border windows, and the main text area,