doc: warn against streaming from character devices
charcter device streaming works just like any other streams, but hangs on the close callsite due to the worker thread being blocked on the read and main thread waiting for any async event that may not occur.
Document this behavior and suggest a potential workaround.
Fixes: https://github.com/nodejs/node/issues/15439
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines