[gtk/transform-origin: 1/2] docs: Fix reference for css transform

[Matthias Clasen <matthiasc src gnome org>]

commit 4c971cd4da925d8cac0286366d5b22204ee91a55
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 24 22:47:25 2021 -0500

    docs: Fix reference for css transform
    
    Refer to the canonical location for the css
    transform spec.

 docs/reference/gtk/css-properties.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/reference/gtk/css-properties.md b/docs/reference/gtk/css-properties.md
index 7e6fcdedaa..c44b1308d1 100644
--- a/docs/reference/gtk/css-properties.md
+++ b/docs/reference/gtk/css-properties.md
@@ -159,11 +159,11 @@ done with
 |-gtk-icon-source| [Image](https://www.w3.org/TR/css-backgrounds-3/#typedef-image), `builtin` or `none` | 
used for builtin icons in buttons and expanders |
 |-gtk-icon-size| [Length](https://www.w3.org/TR/css3-values/#length-value) | size used for builtin icons in 
buttons and expanders |
 |-gtk-icon-style| `requested`, `regular` or `symbolic` | preferred style for application-loaded icons |
-|-gtk-icon-transform| [Transform list](https://drafts.csswg.org/css-transforms-1/#typedef-transform-list) or 
`none` | applied to builtin and application-loaded icons |
+|-gtk-icon-transform| [Transform list](https://www.w3.org/TR/css-transforms-1/#typedef-transform-list) or 
`none` | applied to builtin and application-loaded icons |
 |-gtk-icon-palette| Color palette, as explained above | used to recolor symbolic icons |
 |-gtk-icon-shadow| [Shadow](https://www.w3.org/TR/css-backgrounds-3/#typedef-shadow) or `none` | applied to 
builtin and application-loaded icons |
 |-gtk-icon-filter| [Filter value list](https://www.w3.org/TR/filter-effects-1/#typedef-filter-value-list) or 
`none` | applied to builtin and application-loaded icons |
-|transform| [CSS Transforms Level 2](https://drafts.csswg.org/css-transforms-2/) | |
+|transform| [CSS Transforms Level 1](https://www.w3.org/TR/css-transforms-1/#transform-property) | |
 |min-width| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#min-width) | CSS allows percentages |
 |min-height| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#min-height) | CSS allows percentages |
 |margin-top| [CSS Box Model Level 3](https://www.w3.org/TR/css3-box/#margin-top) | CSS allows percentages or 
auto |