adding example link into changelog

docs/release-notes/change-log.md

@@ -11,7 +11,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## Unreleased
 
-* Implement a `use` feature, enabling a module to use an existing module by overriding its inputs or initial block. (Inputs should have the same output type than override module's inputs)
+* Implement a `use` feature, enabling a module to use an existing module by overriding its inputs or initial block. (Inputs should have the same output type than override module's inputs).
+  Check a usage of this new feature on the [substreams-db-graph-converter](https://github.com/streamingfast/substreams-db-graph-converter/) repository. 
 
 * Pick up docs from the README.md or README in the same directory as the manifest, when top-level package.doc is empty
 * Tier2 service now supports a maximum concurrent requests limit. Default set to 0 (unlimited).