Re: [quicwg/base-drafts] Fix language around CC on migration (#2918)

[ianswett <[e-mail]>]

ianswett approved this pull request.

Thanks, LGTM

>  immediately reset the congestion controller and round-trip time estimator for
-the new path to initial values (see Sections A.3 and B.3 in {{QUIC-RECOVERY}}).
-
-An endpoint MUST NOT return to the send rate used for the previous path unless
-it is reasonably sure that the previous send rate is valid for the new path.
-For instance, a change in the client's port number is likely indicative of a
-rebinding in a middlebox and not a complete change in path.  This determination
-likely depends on heuristics, which could be imperfect; if the new path capacity
-is significantly reduced, ultimately this relies on the congestion controller
-responding to congestion signals and reducing send rates appropriately.
+the new path to initial values (see Sections A.3 and B.3 in {{QUIC-RECOVERY}})
+unless it has knowledge that the previous send rate or round-trip time estimate
+is valid for the new path.  For instance, an endpoint might infer that a change
+in only the client's port number is likely indicative of a NAT rebinding,
+meaning that the new path is likely to have similar bandwidth and round-trip
+time. This determination might be a heuristic and is likely to be imperfect.  If

```suggestion
time. This determination is likely to be imperfect.  If
```

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