[FIX] Fix a dead link in maintaining (#237)

docs/maintaining.md

@@ -82,7 +82,7 @@ If you have followed the [initial setup](getting_started.md)
 and have deployed your Neurobagel node from our Docker Compose recipe,
 your node now has a dedicated graph database that stores
 the datasets for your node.
-By default, the graph database will only contain an [example dataset called `BIDS synthetic`](https://github.com/neurobagel/recipes/blob/main/data/example_synthetic_pheno-bids.jsonld). 
+By default, the graph database will only contain an [example dataset called `BIDS synthetic`](https://github.com/neurobagel/recipes/blob/main/data/example_synthetic_pheno-bids-derivatives.jsonld). 
 
 Replacing the existing data in your graph database with your own data (or updated data) is a straightforward process.
 Once you have generated or updated the JSONLD files you want to upload,