Add information about rollback support to Reference/Component specs/State stores

[sclarke81]

What content needs to be created or modified?
Currently there is a Note on the State stores page saying "State stores can be used for actors if it supports both transactional operations and ETag." Redis is listed as being Transactional. However, when using Redis as the state store for Dapr Workflows a log entry is produced saying "Redis does not support transaction rollbacks and should not be used in production as an actor state store."

Describe the solution you'd like

Remove the check for Actor support from Redis and replace with an asterisk linking to a note saying "Redis does not support transaction rollbacks and should not be used in production as an actor state store."

Where should the new material be placed?
Reference/Component specs/State stores