fix(src/installing-deis/configuring-object-storage.md): add helm generate logic to the registry credentials section

Author: Aaron Schlesinger

src/installing-deis/configuring-object-storage.md

@@ -93,7 +93,7 @@ The registry looks for a `REGISTRY_STORAGE` environment variable, which it then
 
 ### Credentials
 
-The registry reads the credential information from a `/var/run/secrets/deis/registry/creds/objectstorage-keyfile` file. See https://github.com/deis/charts/blob/master/deis-dev/tpl/deis-objectstorage-secret.yaml for an example of what that file should look like.
+The registry reads the credential information from a `/var/run/secrets/deis/registry/creds/objectstorage-keyfile` file. This is generated automatically during helm generate based on the configuration options given in the https://github.com/deis/charts/blob/master/deis-dev/tpl/objectstorage.toml.
 
 ## [deis/database](https://github.com/deis/postgres)