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Add IpUtils::isPrivateIp docs

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Original file line number	Diff line number	Diff line change
@@ -361,6 +361,23 @@ analysis purposes. Use the ``anonymize()`` method from the
`361`	`361`	`$anonymousIpv6 = IpUtils::anonymize($ipv6);`
`362`	`362`	`// $anonymousIpv6 = '2a01:198:603:10::'`
`363`	`363`
	`364`	`+Check if an IP belongs to a private subnet`
	`365`	`+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
	`366`	`+`
	`367`	`+If you need to know if an IP address belongs to a private subnet, you can`
	`368`	+use the ``isPrivateIp()`` method from the
	`369`	+:class:`Symfony\\Component\\HttpFoundation\\IpUtils` to do that::
	`370`	`+`
	`371`	`+ use Symfony\Component\HttpFoundation\IpUtils;`
	`372`	`+`
	`373`	`+ $ipv4 = '192.168.1.1';`
	`374`	`+ $isPrivate = IpUtils::isPrivateIp($ipv4);`
	`375`	`+ // $isPrivate = true`
	`376`	`+`
	`377`	`+ $ipv6 = '2a01:198:603:10:396e:4789:8e99:890f';`
	`378`	`+ $isPrivate = IpUtils::isPrivateIp($ipv6);`
	`379`	`+ // $isPrivate = false`
	`380`	`+`
`364`	`381`	`Accessing other Data`
`365`	`382`	`~~~~~~~~~~~~~~~~~~~~`
`366`	`383`

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