[ja] Update concepts/cluster-administration/networking.md

[t-inu]

fixes #33000

Ref: #35754
Also update addons.md accordance with the above PR.
Add IDs to all headings because they may be linked from other pages in the future.
I verified that adding these IDs don't affect links on existing pages.

Preview:
https://deploy-preview-35051--kubernetes-io-main-staging.netlify.app/ja/docs/concepts/cluster-administration/networking/
https://deploy-preview-35051--kubernetes-io-main-staging.netlify.app/ja/docs/concepts/cluster-administration/addons/
en:
https://kubernetes.io/docs/concepts/cluster-administration/networking/
https://github.com/kubernetes/website/blob/main/content/en/docs/concepts/cluster-administration/networking.md
https://kubernetes.io/docs/concepts/cluster-administration/addons/
https://github.com/kubernetes/website/blob/main/content/en/docs/concepts/cluster-administration/addons.md

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[atoato88]

FYI:
PR #35754 which might be big change to a original EN page is created just yesterday.
I think it's better to keep an eye on that PR. 🤔

[atoato88]

/cc

[t-inu]

@atoato88 Thank you for the information.
As you said, I'd like to focus on what will be updated.

[nasa9084]

/assign

[atoato88]

That PR made progress. More bigger changes may be going to come, but it's easy way to update, I think.
Because which will eliminate the list and create link to other page.
In any case, It's needed to focus on that. 😁

[atoato88]

Finally, PR #35754 was merged.
We can go. 😉

[t-inu]

/retitle [ja] Update concepts/cluster-administration/networking.md

[nasa9084]

/approve

[k8s-ci-robot]

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[atoato88]

/lgtm
Thank you for updating!

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: a649c1e02ae3b2d0e6ecc4cf4fc666d5a454a9d2

[t-inu]

I resolved the conflict.
After rebased, this URL
[ネットワーク設計ドキュメント](https://git.k8s.io/community/contributors/design-proposals/network/networking.md)
changed to
[ネットワーク設計ドキュメント](https://git.k8s.io/design-proposals-archive/network/networking.md)
This change is the same to my updating, so need not to fix anything.

[atoato88]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 5b88854881b77cc663464cfd675287f342febed3