[css-backgrounds-3] link fixes

Author: svgeesus

css-backgrounds-3/Overview.bs

@@ -42,7 +42,7 @@ spec:css-values-3; type:type; text:<position>
 <p><em>This subsection is not normative.</em>
 
 <p>When elements are rendered according to the
-<a href="https://www.w3.org/TR/css-box-3/#the-css-box-model">CSS box model</a> [[!CSS-BOX-3]],
+<a href="https://www.w3.org/TR/css-box-3/#box-model">CSS box model</a> [[!CSS-BOX-3]],
 each element is either not displayed at all, or formatted as one
 or more rectangular boxes. Each box has a rectangular content
 area, a band of padding around the content, a border around the
@@ -108,7 +108,7 @@ Value Definitions</h3>
 <p><!-- <a href="http://www.w3.org/Style/CSS/Tracker/issues/210">ISSUE-210.]</a> -->
 It is expected that CSS will include ways to
 animate transitions between styles. (The
-section <a href="https://www.w3.org/TR/css3-transitions/#animatable-types">“Animation of property types”</a>
+section <a href="https://www.w3.org/TR/css-transitions-1/#animatable-types">“Animation of property types”</a>
 of the <cite>CSS Transitions
 module</cite> [[CSS3-TRANSITIONS]] is expected to define how different
 kinds of values are interpolated during a transition.) In anticipation
@@ -1357,7 +1357,7 @@ color ('border-color'), and thickness ('border-width') of the border.
     <td><<color>>
   <tr>
     <th>Initial:
-    <td><a href="https://www.w3.org/TR/css3-color/#currentcolor">currentColor</a>
+    <td><a href="https://www.w3.org/TR/css-color-4/#currentcolor">currentColor</a>
   <tr>
     <th>Applies to:
     <td>all elements except [=ruby base containers=] and [=ruby annotation containers=]