doc: clear up child_process command resolution
Fixes: https://github.com/nodejs/node/issues/20605 Refs: https://github.com/libuv/libuv/pull/1837
/cc @richardlau @nodejs/platform-windows @nodejs/documentation @nodejs/child_process
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines