docs/metrics: Correct label typo family in metrics.rst
docs/metrics: Correct label typo family in metrics.rst

This PR is to correct simple typo in metrics.rst

Signed-off-by: Tam Mach <928487046a9c42ed56ed508a413e2eaabffae612@yahoo.com>

cilium/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium,tklauser/cilium,cilium-team/cilium,cilium/cilium,tklauser/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,cilium-team/cilium,tgraf/cilium,tgraf/cilium