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Fix a mistake: there were never 10 directory authorities -- there were 9 v3...

Merged Roger Dingledine requested to merge num-dir-auths into main
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@@ -20,7 +20,7 @@ Because the Tor client chooses the path, it can make sure to get Tor's "distribu
Each relay has a long-term public signing key called the "identity key".
Each directory authority additionally has a "directory signing key".
The directory authorities [provide a signed list](https://spec.torproject.org/dir-spec) of all the known relays, and in that list are a set of certificates from each relay (self-signed by their identity key) specifying their keys, locations, exit policies, and so on.
So unless the adversary can control a majority of the directory authorities (as of 2021 there are 10 directory authorities), they can't trick the Tor client into using other Tor relays.
So unless the adversary can control a majority of the directory authorities (as of 2022 there are 8 directory authorities), they can't trick the Tor client into using other Tor relays.
### How do clients know what the directory authorities are?
The Tor software comes with a built-in list of location and public key for each directory authority.
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