Update the Solar Maintenance Notebook

Signed-off-by: cyiallou - Costas <[email protected]>

Author: cyiallou

RELEASE_NOTES.md

@@ -6,7 +6,7 @@
 
 * Expose MicrogridData from microgrid namespace.
 * Upgrade `frequenz-client-reporting` to minimum `v0.16.0`.
-* Small updates to the Alerts Notebook.
+* Small updates to the Alerts Notebook and Solar Maintenance notebook.
 
 ## New Features
 * Notification service: Introduced `NotificationSendError` for structured retry failure handling and updated the logging in `send_test_email()` utility function.