Docs have the wrong name for the `auth.email.otp_expiry` param

[icopp]

Describe the bug

• The docs list this as otp_exp, when it's actually otp_expiry

To Reproduce Steps to reproduce the behavior:

1. Try to use auth.email.otp_exp in config.toml
2. It doesn't work

Expected behavior The docs should have the correct name

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System information n/a

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