feat(AuditLogs): add `Who unbanned user?`

[dager-mohamed]

Please describe the changes this PR makes and why it should be merged:

Adding more info about Auditlogs like who unbanned user.

[almostSouji]

Where is the added value to the guide here, compared to banning? Isn't it just another type? I don't plan on explaining each and every audit log type with an example; explaining it on the example of one should be enough if it's not adding any new nuance to it