doc: change logical to bitwise OR in dns lookup

The `hints` value will be a number. To specify more than one hints,
their corresponding bits have to be set. So bitwise OR should be used
instead of logical OR.

PR-URL: https://github.com/nodejs/node/pull/11037



Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>