Clarify reducer state updater convention#8536
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Summary
Why
In Past, i actually have production design system component issue caused by someone updates state using existing state directly instead of using prevState from the parameter passed,
i do not want this approach creates bad habit.
The revised lesson teaches new readers the safe convention first: whenever new state is calculated from previous state, pass an updater function and call its argument
prevState. It introduces batching only after the implementation is understood, as the reason the convention matters.