Update docs/configuring-playbook-synapse-s3-storage-provider.md: fix the path to media-store directory

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-synapse-s3-storage-provider.md

@@ -47,7 +47,7 @@ matrix_synapse_ext_synapse_s3_storage_provider_config_storage_class: STANDARD #
 # For additional advanced settings, take a look at `roles/custom/matrix-synapse/defaults/main.yml`
 ```
 
-If you have existing files in Synapse's media repository (`/matrix/synapse/media-store/..`):
+If you have existing files in Synapse's media repository (`/matrix/synapse/storage/media-store/..`):
 
 - new files will start being stored both locally and on the S3 store
 - the existing files will remain on the local filesystem only until [migrating them to the S3 store](#migrating-your-existing-media-files-to-the-s3-store)