Update Iceberg table field documentation (#34847)

Author: ahmedabu98

sdks/java/io/iceberg/src/main/java/org/apache/beam/sdk/io/iceberg/IcebergWriteSchemaTransformProvider.java

@@ -77,7 +77,9 @@ public static Builder builder() {
       return new AutoValue_IcebergWriteSchemaTransformProvider_Configuration.Builder();
     }
 
-    @SchemaFieldDescription("Identifier of the Iceberg table.")
+    @SchemaFieldDescription(
+        "A fully-qualified table identifier. You may also provide a template to write to multiple dynamic destinations,"
+            + " for example: `dataset.my_{col1}_{col2.nested}_table`.")
     public abstract String getTable();
 
     @SchemaFieldDescription("Name of the catalog containing the table.")

website/www/site/content/en/documentation/io/managed-io.md

@@ -315,7 +315,7 @@ and Beam SQL is invoked via the Managed API under the hood.
         <code style="color: green">str</code>
       </td>
       <td>
-        Identifier of the Iceberg table.
+        A fully-qualified table identifier. You may also provide a template to write to multiple dynamic destinations, for example: `dataset.my_{col1}_{col2.nested}_table`.
       </td>
     </tr>
     <tr>