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doc: dns.lookup() documentation error code

Rodrigo Muino Tomonari requested to merge github/fork/jvelezpo/docs-dns into master

dns.lookup() will always return ENOTFOUND on a empty lookup or when the host not found. https://github.com/nodejs/node/blob/master/lib/internal/errors.js#L503

Fixes: https://github.com/nodejs/node/issues/27604

  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • documentation is changed or added
  • commit message follows commit guidelines

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