33985 enable relative color syntax ff release (#34224)

* added release note for firefox relative color syntax

* removed the experimental note for relative color syntax

files/en-us/mozilla/firefox/experimental_features/index.md

@@ -226,46 +226,6 @@ See [Firefox bug 1889133](https://bugzil.la/1889133) for more details.
   </tbody>
 </table>
 
-### Relative color syntax
-
-[Relative color syntax](/en-US/docs/Web/CSS/CSS_colors/Relative_colors) is now enabled by default in the Nightly release and via the `layout.css.relative-color-syntax.enabled` preference set to `true` in other release versions. Relative color syntax allows you to create a color value relative to an origin color, and can allow you to change a color in a different [color space](/en-US/docs/Glossary/Color_space) using [color functions](/en-US/docs/Web/CSS/CSS_colors#functions) ([Firefox bug 1701488](https://bugzil.la/1701488)).
-
-<table>
-  <thead>
-    <tr>
-      <th>Release channel</th>
-      <th>Version added</th>
-      <th>Enabled by default?</th>
-    </tr>
-  </thead>
-  <tbody>
-    <tr>
-      <th>Nightly</th>
-      <td>128</td>
-      <td>Yes</td>
-    </tr>
-    <tr>
-      <th>Developer Edition</th>
-      <td>127</td>
-      <td>No</td>
-    </tr>
-    <tr>
-      <th>Beta</th>
-      <td>127</td>
-      <td>No</td>
-    </tr>
-    <tr>
-      <th>Release</th>
-      <td>127</td>
-      <td>No</td>
-    </tr>
-    <tr>
-      <th>Preference name</th>
-      <td colspan="2"><code>layout.css.relative-color-syntax.enabled</code></td>
-    </tr>
-  </tbody>
-</table>
-
 ### Single numbers as aspect ratio in media queries
 
 Support for using a single {{cssxref("number")}} as a {{cssxref("ratio")}} when specifying the aspect ratio for a [media query](/en-US/docs/Web/CSS/CSS_media_queries). (See [Firefox bug 1565562](https://bugzil.la/1565562) for more details.)

files/en-us/mozilla/firefox/releases/128/index.md

@@ -18,6 +18,7 @@ This article provides information about the changes in Firefox 128 that affect d
 
 ### CSS
 
+- [Relative color syntax](/en-US/docs/Web/CSS/CSS_colors/Relative_colors) is now enabled by default. Relative color syntax allows you to create a color value relative to an origin color, and can allow you to change a color in a different [color space](/en-US/docs/Glossary/Color_space) using [color functions](/en-US/docs/Web/CSS/CSS_colors#functions) ([Firefox bug 1900251](https://bugzil.la/1900251)).
 - The [`content`](/en-US/docs/Web/CSS/content) property now supports [alternative text](/en-US/docs/Web/CSS/content#alternative_text) for content that includes an image. The alternative text is then exposed to the browsers accessibility tree. (See [Firefox bug 1281158](https://bugzil.la/1281158) and [Firefox bug 1896047](https://bugzil.la/1896047)).
 
 #### Removals