calendar: Use markdown for css tree

diff --git a/gtk/gtkcalendar.c b/gtk/gtkcalendar.c
index 596119ee93bad19c4df2cf1701e4c61a7146af13..a8c455321edb6b85f14facf6789c90fdd205cdbc 100644 (file)
--- a/gtk/gtkcalendar.c
+++ b/gtk/gtkcalendar.c
@@ -53,7 +53,7 @@
  *
  * # CSS nodes
  *
- * |[<!-- language="plain" -->
+ * ```
  * calendar.view
  * ├── header
  * │   ├── button
@@ -64,7 +64,7 @@
  * │   ╰── button
  * ╰── grid
  *     ╰── label[.day-name][.week-number][.day-number][.other-month][.today]
- * ]|
+ * ```
  *
  * `GtkCalendar` has a main node with name calendar. It contains a subnode
  * called header containing the widgets for switching between years and months.