doc: Update docs to indicate that `sub` is required.

mozilla-services / autopush-rs

Push Server in Rust

Mozilla Public License 2.0

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doc: Update docs to indicate that `sub` is required. #758

Closed jrconlin closed 3 weeks ago

jrconlin commented 3 weeks ago

We require the sub so that we can contact folk that are possibly doing questionable things. While we don't validate the contact URI, if we see a problem and we can't contact folk, it probably means we're just going to block them.

Closes #SYNC-3678