[16][Doc] queue_job_subscribe - Update README to Clarify location of the permission checkbox

[fcvalgar]

Description:

The README was incorrect and did not properly describe the location of the permission checkbox. This update clarifies that the Job Notifications checkbox is located under the Connectors tab in the user configuration form.

Proposed Update:
Usage
In the user configuration form, under the Connectors tab, there is a new Job Notifications checkbox.

If checked, the user will automatically follow failed jobs, provided they are part of the Job Queue Manager group.
If unchecked, the user will not become a follower of failed jobs, even if they belong to the Job Queue Manager group.