yongsk0066

Update docs (nextjs, next.config.js)

1

## Summary I've made a small contribution aimed at addressing an issue noted in [#860](https://github.com/gregberge/svgr/issues/860). The problem was concerning the possibility of a TypeError occurring in the next.config.js example code...

[Fix] Simplify pendingState type in useActionState

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## Summary This pull request simplifies the type definition of `pendingState` in the `useActionState` hook by changing it from `Thenable | boolean` to just `boolean`. The current implementation of `useActionState`...