Update useSortBy docs

[Jeffdude]

According to sortTypes.js these are the new sortTypes.

Thanks all for your great work on this project.

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[github-actions]

This pull request is being marked as stale (no activity in the last 14 days)

[github-actions]

This pull request has been detected as stale (no activity in the last 14 days) and automatically closed. It's very likely that your pull request has remained here this long because it introduces breaking changes to the v7 API. React Table v8 is currently in alpha (soon beta!) and already contains bug fixes, performance improvements and architectural changes that likely address the issue this pull request is meant to solve.

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[Jeffdude]

Why was this abandoned? It actually updated an out of date doc. @tannerlinsley