[libadwaita] docs: fix link to property of AdwHeaderBar

[Alexander Mikhaylenko <alexm src gnome org>]

commit 3da32a35cbeb192ccb2577639d504e5ff336abff
Author: Ungedummt <ungedummt gmx de>
Date:   Mon Jan 17 23:26:52 2022 +0100

    docs: fix link to property of AdwHeaderBar

 src/adw-header-bar.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/adw-header-bar.c b/src/adw-header-bar.c
index 0cddfd5d..2ff30eb2 100644
--- a/src/adw-header-bar.c
+++ b/src/adw-header-bar.c
@@ -41,7 +41,7 @@
  * `AdwHeaderBar` is similar to [class@Gtk.HeaderBar], but provides additional
  * features compared to it. Refer to `GtkHeaderBar` for details.
  *
- * [property.HeaderBar:centering-policy] allows to enforce strict centering of
+ * [property@HeaderBar:centering-policy] allows to enforce strict centering of
  * the title widget, this is useful for [class@ViewSwitcherTitle].
  *
  * [property@HeaderBar:show-start-title-buttons] and