[quicwg/base-drafts] ECN text refers to RTO (#2534)

[martinduke <[e-mail]>]

Section 13.3.2 "ECN Verification"

> If an endpoint sets ECT codepoints on outgoing IP packets and encounters a retransmission timeout due to the absence of acknowledgments from the peer (see {{QUIC-RECOVERY}}), or if an endpoint has reason to believe that an element on the network path might be corrupting ECN codepoints, the endpoint MAY cease setting ECT codepoints...

Although I understand the intent here, retransmission timeouts, as a term, don't exist anymore in QUIC except during handshakes.

Disabling ECN after any PTO firing seems a bit extreme, so I'd like to see a better recommendation here, which covers both handshakes and short headers.

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