Fix Subscription docs to match Kubernetes CRDs

[gcaracuel]

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Description

Updates https://docs.dapr.io/reference/resource-specs/subscription-schema/ to match CRDs properties from https://github.com/dapr/dapr/blob/release-1.12/charts/dapr/crds/subscription.yaml.

Changes some properties from the current docs which are wrong and prevents Subscriptions resources to be created from this docs.

Maybe hardest to catch is match is not optional as per -> https://github.com/dapr/dapr/blob/release-1.12/charts/dapr/crds/subscription.yaml#L134-L135

Issue reference

I do not have a reported issues and this change is small enough to not need it.