[gtk/matthiasc/for-master] docs: Update border-size docs

[Matthias Clasen <matthiasc src gnome org>]

commit 40eae298d51a3c370564f12bc3b2f0628cdefe86
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jan 26 10:40:22 2021 -0500

    docs: Update border-size docs
    
    GtkCenterLayout respected border-size as well.

 docs/reference/gtk/css-properties.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/reference/gtk/css-properties.md b/docs/reference/gtk/css-properties.md
index 96fb3be0e0..7338aef96b 100644
--- a/docs/reference/gtk/css-properties.md
+++ b/docs/reference/gtk/css-properties.md
@@ -236,4 +236,4 @@ done with
 |animation-delay| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-delay) | |
 |animation-fill-mode| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation-fill-mode) | 
|
 |animation| [CSS Animations Level 1](https://www.w3.org/TR/css3-animations/#animation) | |
-|border-spacing| [CSS Table Level 3](https://www.w3.org/TR/css-tables-3/#border-spacing-property) | 
respected by GtkBox and GtkGrid |
+|border-spacing| [CSS Table Level 3](https://www.w3.org/TR/css-tables-3/#border-spacing-property) | 
respected by GtkBoxLayout, GtkGridLayout, GtkCenterLayout |