[tepl] MetadataStore docs: fix another todo comment

[Sébastien Wilmet <swilmet src gnome org>]

commit dc65d3aa6c22c4aad74430b00942099cefc88ee5
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Wed Apr 15 15:15:52 2020 +0200

    MetadataStore docs: fix another todo comment

 tepl/tepl-metadata-store.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/tepl/tepl-metadata-store.c b/tepl/tepl-metadata-store.c
index 313aa65..ad9e6a2 100644
--- a/tepl/tepl-metadata-store.c
+++ b/tepl/tepl-metadata-store.c
@@ -966,8 +966,7 @@ resize_hash_table_according_to_max_number_of_locations (TeplMetadataStore *store
  * tepl_metadata_store_set_store_file() before.
  *
  * An asynchronous version doesn't exist because this function is meant to be
- * called on application shutdown. TODO: refer to #GApplication API, the exact
- * shutdown phase.
+ * called on application shutdown. See the #GApplication::shutdown signal.
  *
  * This function respects the configuration as set with
  * tepl_metadata_store_set_max_number_of_locations().