Re: [whatwg/fetch] Block access to ::, ::ffff:0:0, and 0.0.0.0 (PR #1763)

Could we say something like this?
```
 <li><p>If <var>ipAddresses</var> <a for=set>contains</a> <code>::</code>, <code>::ffff:0:0</code>,
 or <code>0.0.0.0</code>, or <var>ipAddresses</var> contains an IP address that maps to <code>0.0.0.0</code> then return failure.
```

We should also reference all the known relevant RFCs.
I think browsers should be able to determine nat64 prefixes.

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