Remove Token Endpoint Auth Method from configuration steps

[ewanharris]

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Description

Due to a recent refactor in the management UI this is no longer shown by default on new SPA applications. It will be shown on older SPA applications but the setting is locked to None

References

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Testing

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Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
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• The correct base branch is being used, if not the default branch