[Documentation] Add documentation for instance level streaming audit event UI changes

@hraghuvanshi, Please add a group or category label to identify issue ownership.

You can refer to the Features by Group handbook page for guidance.

If you are unsure about the correct group, please do not leave the issue without a group label, and refer to GitLab's shared responsibility functionality guidelines for more information on how to triage this kind of issue.

This message was generated automatically. You're welcome to improve it.

This issue was automatically tagged with the label ~"group::authentication and authorization" by TanukiStan, a machine learning classification model, with a probability of 0.74.

If this label is incorrect, please tag this issue with the correct group label as well as automation:ml wrong to help TanukiStan learn from its mistakes.

If you are unsure about the correct group, please do not leave the issue without a group label. Please refer to GitLab's shared responsibility functionality guidelines for more information on how to triage this kind of issues.

Authors who do not have permission to update labels can leave the issue to be triaged by group leaders initially assigned by TanukiStan

This message was generated automatically. You're welcome to improve it.