Spell Antiforgery correctly

[programatt]

What issue does this PR address?
Mispelling of Antiforgery in the Interface Name

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[brockallen]

Oh that's a bummer. Well, thanks for this, but given that the type name needs changing, we will need to hold off on this until a new release. We'll leave this open until we can figure out when that will be.

Thanks again.

[brockallen]

Ok, given that one one should be using this directly then we decided that it's likely safe to do this now. Thanks!