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doc: clarify what dns.setResolvers() affects
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It does not affect dns.lookup().

PR-URL: #25570
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
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sam-github authored and MylesBorins committed May 16, 2019
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Expand Up @@ -575,6 +575,10 @@ An error will be thrown if an invalid address is provided.
The `dns.setServers()` method must not be called while a DNS query is in
progress.

The [`dns.setServers()`][] method affects only [`dns.resolve()`][],
[`dns.resolve*()`][] and [`dns.reverse()`][] (and specifically *not*
[`dns.lookup()`][]).

Note that this method works much like
[resolve.conf](http://man7.org/linux/man-pages/man5/resolv.conf.5.html).
That is, if attempting to resolve with the first server provided results in a
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