Update setting-up-your-editor.md

[eip1599]

Auto Fix is enabled by default. Use the single string form.

Warning is shown in .vscode/settings.json due to changes in vscode-eslint.

As autoFix is set to default, object format in eslint.validate is now deprecated.

Check this commit. vscode-eslint#7b5c40536131aa94eccd8a175e37104f5b785071

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[facebook-github-bot]

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[stale]

This pull request has been automatically marked as stale because it has not had any recent activity. It will be closed in 5 days if no further activity occurs.

[eip1599]

@iansu , @amyrlam . Could you confirm this simple change?

[ianschmitz]

Thanks!