[Currents] Remove claim about dynamic allow listing from Currents documentation - DI-6172

[ferrous26]

Why are you making this change? (required)

We had a PQ come in that was asking about dynamic allow listing for Currents. This ends up being confusing for customers since it seems to imply features that our partners would have to provide.

And since our partners do not provide this feature, we definitely should not claim that it exists.

Related PRs, issues, or features (optional)

https://servicedesk.braze.com/browse/PQ-6789

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[ferrous26]

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[rachel-feinberg]

Lgtm!