Fix hyperlink broken markdown reconfigure-default-service-ip-ranges.md

[fedebongio]

Description

This is a simple fix on the markdown that had a broken link. I've followed the other links on the same page that use the full url reference to the section

Issue

There is no open issue created (afaik) but the markdown is incorrect or incomplete in the section:
https://kubernetes.io/docs/tasks/network/reconfigure-default-service-ip-ranges/#kubernetes-service-cidr-reconfiguration-categories ----> Anything that results in changing the primary service CIDR

cc @aojea

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[aojea]

It seems it fails to build

[fedebongio]

I'll take a look