feat: UTC-477: Remove custom agreement metric from Starter Cloud (#9180)

Co-authored-by: mcanu <mcanu@users.noreply.github.com>

Author: mcanu

docs/source/guide/label_studio_compare.md

@@ -295,11 +295,17 @@ Label Studio is available to everyone as open source software (Label Studio Comm
     <td style="text-align:center">✅</td>
   </tr>
   <tr>
-    <td><b>Agreement metrics</b><br/><a href="https://docs.humansignal.com/guide/stats.html">Define how annotator consensus is calculated. You can choose from pre-defined metrics or customize your own.</a></td>
+    <td><b>Agreement metrics</b><br/><a href="https://docs.humansignal.com/guide/stats.html">Define how annotator consensus is calculated using pre-defined agreement metrics.</a></td>
     <td style="text-align:center">❌</td>
     <td style="text-align:center">✅</td>
     <td style="text-align:center">✅</td>
   </tr>
+  <tr>
+    <td><b>Custom agreement metrics</b><br/><a href="https://docs.humansignal.com/guide/custom_metric.html">Write your own custom agreement metric.</a></td>
+    <td style="text-align:center">❌</td>
+    <td style="text-align:center">❌</td>
+    <td style="text-align:center">✅</td>
+  </tr>
   <tr>
     <td><b>Comments and notifications</b><br/><a href="https://docs.humansignal.com/guide/comments_notifications.html">Team collaboration features like comments and notifications on annotation tasks.</a></td>
     <td style="text-align:center">❌</td>