Update asset-syncer.md (#8185)

### Description of the change

Just documentation udpate.

### Benefits

Docs get updated.

### Possible drawbacks

None

### Applicable issues

NA

### Additional information

NA

Signed-off-by: Jesús Miguel Benito Calzada <jesus.benito@broadcom.com>

Author: beni0888

site/content/docs/latest/reference/developer/asset-syncer.md

@@ -38,7 +38,7 @@ This builds the `asset-syncer` Docker image.
 ### Running in development
 
 ```bash
-export DB_PASSWORD=$(kubectl get secret --namespace kubeapps kubeapps-db -o go-template='{{index .data "postgres-password" | base64decode}}')
+export DB_PASSWORD=$(kubectl get secret --namespace kubeapps kubeapps-postgresql -o go-template='{{index .data "postgres-password" | base64decode}}')
 telepresence --namespace kubeapps --docker-run -e DB_PASSWORD=$DB_PASSWORD --rm -ti kubeapps/asset-syncer /asset-syncer sync --database-user=postgres --database-url=kubeapps-postgresql:5432 --database-name=assets stable https://kubernetes-charts.storage.googleapis.com
 ```