add mongodbio and datadogio to io connectors for yaml (#39223)

Author: derrickaw

website/www/site/content/en/documentation/io/connectors.md

@@ -809,7 +809,11 @@ This table provides a consolidated, at-a-glance overview of the available built-
       <a href="https://pkg.go.dev/github.com/apache/beam/sdks/v2/go/pkg/beam/io/mongodbio">native</a>
     </td>
     <td>Not available</td>
-    <td>Not available</td>
+    <td class="present">
+      ✔
+      <br>
+      <a href="https://beam.apache.org/releases/yamldoc/current/#readfrommongodb">read</a> / <a href="https://beam.apache.org/releases/yamldoc/current/#writetomongodb">write</a>
+    </td>
     <td class="present">✔</td>
     <td class="absent">✘</td>
     <td class="absent">✘</td>
@@ -1252,7 +1256,11 @@ This table provides a consolidated, at-a-glance overview of the available built-
     <td>Not available</td>
     <td>Not available</td>
     <td>Not available</td>
-    <td>Not available</td>
+    <td class="present">
+      ✔
+      <br>
+      <a href="https://beam.apache.org/releases/yamldoc/current/#writetodatadog">write</a>
+    </td>
     <td class="present">✔</td>
     <td class="present">✔</td>
     <td class="absent">✘</td>