Clean up services-networking/_index.md

[windsonsea]

• Provide bullets with consistent indentations
• Put url text into a single line
• Tweak long lines
• Minor changes like using "pod" consistently in lowercase in the middle of the sentence

/kind cleanup

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[Shubham82]

Thanks @windsonsea for the PR
Preview looks good to me:
https://deploy-preview-47982--kubernetes-io-main-staging.netlify.app/docs/concepts/services-networking/

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: e602c31836d6f0c3e785c75c0d67b6008f1364c0

[tengqm]

/approve

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