doc: Question on How to: Horizontally scale subscribers with StatefulSets

**Describe the issue**

I have a question on this part:
* Broadcast: each message published on the topic will be consumed by all subscribers.
* Shared: a message is consumed by any subscriber (but not all).
So, where is the configuration for that?

**URL of the docs**

https://docs.dapr.io/developing-applications/building-blocks/pubsub/howto-subscribe-statefulset/

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**Expected content**

I expect there is a configuration link that is associated with the description.