Fix dead link to jupyter hook implementation example

Author: Diogo Correia

docs/jupyterhub.md

@@ -138,7 +138,7 @@ def change_pod_manifest(self: KubeSpawner):
 ```
 
 The hook function should be part of a library installable as a pip package.
-To see a real example, refer to the main [hook implementation](../applications/jupyterhub/src/harness_jupyter/jupyterhub.py).
+To see a real example, refer to the main [hook implementation](../applications/jupyterhub/src/harness_jupyter/harness_jupyter/jupyterhub.py).
 
 ### Add the hook
 
@@ -178,5 +178,3 @@ to the [values.yaml](../applications/jupyterhub/deploy/values.yaml) file.
 Cloudharness JupyterHub is integrated with the accounts service so enabling a shared single-sign-on with other applications in the solution.
 
 The spawner is also adapted providing a hook to allow other applications to be based on the hub spawner to run with their own configurations.
-
-Available