[HttpFoundation] Fix IpUtils example

This PR fixes a small bug in the IpUtils class name.

Author: sebpacz

components/http_foundation.rst

@@ -331,11 +331,11 @@ analysis purposes. Use the ``anonymize()`` method from the
     use Symfony\Component\HttpFoundation\IpUtils;
 
     $ipv4 = '123.234.235.236';
-    $anonymousIpv4 = IPUtils::anonymize($ipv4);
+    $anonymousIpv4 = IpUtils::anonymize($ipv4);
     // $anonymousIpv4 = '123.234.235.0'
 
     $ipv6 = '2a01:198:603:10:396e:4789:8e99:890f';
-    $anonymousIpv6 = IPUtils::anonymize($ipv6);
+    $anonymousIpv6 = IpUtils::anonymize($ipv6);
     // $anonymousIpv6 = '2a01:198:603:10::'
 
 Accessing other Data