Fix typo in RxStateExample #trivial

[sanghun0724]

Description:

I found a typo in the RxState/RxStateExample/RxStateExample/StateManagment and fixed it.

Changes Made:

I made the following changes:

1. Change File Name

• ErrorStateManagment -> ErrorStateManagement

2. Change 'func reduce()' Parameter Name

• sction -> action

Thanks you 🙏

[rxswiftcommunity[bot]]

It looks like code was changed without adding anything to the Changelog.

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