mark node phase as deprecated
mark node phase as deprecated

I'm not sure on what the best wording for this should be, but `Node Phase` is no longer populated, and so the docs should say so.

@random-liu on slack/#sig-node told me that they believed node phase was unused.

cc @dawnchen
erictune/erictune.github.io,rata/kubernetes.github.io,aidevops/kubernetes.github.io,aidevops/kubernetes.github.io,aidevops/kubernetes.github.io,rata/kubernetes.github.io,erictune/erictune.github.io,erictune/erictune.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