docs/pods: update reference to pets
docs/pods: update reference to pets

Now that PetSets are implemented we can link there.

aidevops/kubernetes.github.io,erictune/erictune.github.io,rata/kubernetes.github.io,rata/kubernetes.github.io,aidevops/kubernetes.github.io,aidevops/kubernetes.github.io,erictune/erictune.github.io,rata/kubernetes.github.io,erictune/erictune.github.io,aidevops/kubernetes.github.io,aidevops/kubernetes.github.io,rata/kubernetes.github.io,rata/kubernetes.github.io,erictune/erictune.github.io,erictune/erictune.github.io