fix: update tooltip copy

Author: vsgoulart

packages/form-js-editor/src/features/properties-panel/entries/DocumentsDataSource.js

@@ -57,6 +57,20 @@ function DocumentsDataSource(props) {
       <pre>
         <code>{schema}</code>
       </pre>
+      <p>
+        When using Camunda Tasklist UI, additional document reference attributes are automatically handled. Modifying
+        the document reference may affect the document preview functionality.
+      </p>
+      <p>
+        Learn more in our{' '}
+        <a
+          href="https://docs.camunda.io/docs/8.7/components/modeler/forms/form-element-library/forms-element-library-document-preview/"
+          target="_blank"
+          rel="noopener noreferrer">
+          documentation
+        </a>
+        .
+      </p>
     </div>
   );