Docs: Filtering at client vs server.

[guettli]

As a new user, it is not clear where the filtering happens: At the client or at the server?

For example the Selector interfaces (labels/fields).

I would like to improve the documentation here. I think by adding a note at some places could help.

Before I open I PR, I would like to know where you think such a note would make sense.

[AmarNathChary]

For improvement of Documentation, I would suggest you open an issue in k8s/website

[guettli]

@AmarNathChary are you sure? Up to now I saw no Golang related docs at kubernetes.io. At which page do you think that should be added?