[quicwg/base-drafts] Unnecessary packet number expectations in ACK frame description (#3310)

[Dmitri Tikhonov <[e-mail]>]

The [Transport Draft](https://tools.ietf.org/html/draft-ietf-quic-transport-24#section-19.3) contains the following paragraph:

```
   It is expected that a sender will reuse the same packet number across
   different packet number spaces.  ACK frames only acknowledge the
   packet numbers that were transmitted by the sender in the same packet
   number space of the packet that the ACK was received in.
```

I see a few problems with the first sentence:
1. As written, it does not make sense.
1. There is no mention of packet number reuse expectations across packet number spaces in [Section 12.3](https://tools.ietf.org/html/draft-ietf-quic-transport-24#section-12.3).
1. The connection between it and the sentence that follows is not clear.

I propose that the first sentence simply be dropped.

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