fix: correct compose config reference link

The link for compose configs pointed to the legacy-versions page
instead of the configs reference page.

Fixes #24079

Author: lacatoire

content/manuals/engine/swarm/configs.md

@@ -133,7 +133,7 @@ Docker configs.
 
 The `docker stack` command supports defining configs in a Compose file.
 However, the `configs` key is not supported for `docker compose`. See
-[the Compose file reference](/reference/compose-file/legacy-versions.md) for details.
+[the Compose file reference](/reference/compose-file/configs.md) for details.
 
 ### Simple example: Get started with configs