Update export API example

Author: ernestorbemx

.code-samples.meilisearch.yaml

@@ -844,5 +844,7 @@ update_localized_attribute_settings_1: |-
 reset_localized_attribute_settings_1: |-
   client.index("INDEX_NAME").resetLocalizedAttributesSettings();
 export_post_1: |-
-  ExportRequest request = ExportRequest.builder().url("http://anothermeiliinstance:7070").build();
+  Map<String, ExportIndexFilter> indexes = new HashMap<>();
+  indexes.put("*", ExportIndexFilter.builder().overrideSettings(true).build());
+  ExportRequest request = ExportRequest.builder().url("TARGET_INSTANCE_URL").indexes(indexes).build();
   client.export(request);