Issue title: Remove retry policies section for state
 Issue body: As we removed retry policies, this section from the docs should be removed:

https://v1-rc3.docs.dapr.io/developing-applications/building-blocks/state-management/state-management-overview/#retry-policies
 Comments: 
 Comment 0: I am in the overview anyway, so picking up this issue.
 Comment 1: Closed with #1206 
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