Add documentation for pubsub/jetstream tls configuration

[NickLarsenNZ]

Note: maybe there needs to be a new issue template (or reword an existing template) for simple updates?

What content needs to be created or modified?

Document new fields for TLS Client Authentication.

Describe the solution you'd like

N/A

Where should the new material be placed?

Existing

The associated pull request from dapr/dapr, dapr/components-contrib, or other Dapr code repos

https://github.com/dapr/components-contrib/pull/1924

Additional context

N/A