doc,test: clarify that Http2Stream is destroyed after data is read
Correct docs to clarify that behaviour,
and fix a race condition in test-http2-large-write-destroy.js
.
Fixes: https://github.com/nodejs/node/issues/27863
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines