[Enterprise-4.17] OCPBUGS#36951: Updated networking sections with changes in external Ip and OVN-K behaviour

[subhtk]

Cherry-picked commit ID from this #90329

Version: 4.17

Issue:https://issues.redhat.com/browse/OCPBUGS-36951

Link to docs preview:

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Mon Apr 14 13:20:32 - Prow CI generated the docs preview:

https://92132--ocpdocs-pr.netlify.app/microshift/latest/microshift_networking/microshift_network_policy/microshift-network-policy-index.html
https://92132--ocpdocs-pr.netlify.app/openshift-dedicated/latest/networking/network_security/network_policy/about-network-policy.html
https://92132--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/network_security/network_policy/about-network-policy.html
https://92132--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/understanding-networking.html
https://92132--ocpdocs-pr.netlify.app/openshift-rosa/latest/networking/network_security/network_policy/about-network-policy.html

[openshift-ci]

@subhtk: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/validate-portal	1c0bf86	link	true	/test validate-portal
ci/prow/validate-asciidoc	1c0bf86	link	true	/test validate-asciidoc

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