fix documentation for CancelWrite after Close on the send stream

[marten-seemann]

Fixes #4404. Closes #4411. Closes #4408. Closes #4413.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.89%. Comparing base (e310b80) to head (2ed56bb).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4419      +/-   ##
==========================================
+ Coverage   84.88%   84.89%   +0.01%     
==========================================
  Files         152      152              
  Lines       14359    14359              
==========================================
+ Hits        12188    12190       +2     
+ Misses       1671     1670       -1     
+ Partials      500      499       -1     

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[sukunrt]

We need #4408 too right? That handles the case where the stream close has been ACKed. In that case this CancelWrite should be a no-op

[marten-seemann]

We need #4408 too right? That handles the case where the stream close has been ACKed. In that case this CancelWrite should be a no-op

Debatable. Technically yes, but it seems to be such a corner case that is doesn't really matter.