Remove outdated instance id docs

Author: webprofusion-chrisc

docs/hub/guides/agent.md

@@ -78,13 +78,3 @@ When the service is installed using systemd the following commands can be useful
 |Restart the Service | `sudo systemctl restart certify-agent` |
 |Check systemd log | `journalctl -u certify-agent` |
 |Follow current log | `journalctl -u certify-agent -f` |
-
-
-## Troubleshooting
-
-If the agent is listed in the hub, but viewing managed certificates etc fails there may be a mismatch between the instanceID assigned by the hub and the settings currently stored in the agent config. 
-
-To resolve this:
-- Remove the instance from the hub (Managed Instances > Remove)
-- Edit the agents config at `/usr/shre/certify/serviceconfig.json` and remove the `"HubAssignedInstanceId": "<GUID>",` line, then restart the certify-agent service. 
-- Re-join the agent to the hub