Actor.StateManager IActorStateManager is accumulating changes

[oleksandr-bilyk]

What content needs to be created or modified? https://docs.dapr.io/developing-applications/sdks/dotnet/dotnet-actors/dotnet-actors-usage/

Describe the solution you'd like Please explicitly specify that Actor.StateManager implements IActorStateManager class accumulates changes during an actor method execution and saves them transactionally in the end of method execution.

Where should the new material be placed? https://docs.dapr.io/developing-applications/sdks/dotnet/dotnet-actors/dotnet-actors-usage/

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

Additional context none