doc: make sure that calls to .read() are looped
The 'readable' event assumes that calls to readable.read() happens within that event handler until readable.read() returns null.
Fixes: https://github.com/nodejs/node/issues/20503
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines