Update networkpolicies.md
Update networkpolicies.md

FIxed typo in api group path
aidevops/kubernetes.github.io,aidevops/kubernetes.github.io,ronaldpetty/kubernetes.github.io,erictune/erictune.github.io,erictune/erictune.github.io,rata/kubernetes.github.io,rata/kubernetes.github.io,rata/kubernetes.github.io,erictune/erictune.github.io,aidevops/kubernetes.github.io,erictune/erictune.github.io,ronaldpetty/kubernetes.github.io,aidevops/kubernetes.github.io,rata/kubernetes.github.io,ronaldpetty/kubernetes.github.io,aidevops/kubernetes.github.io,rata/kubernetes.github.io,erictune/erictune.github.io