Add firewall configuration to quick start documentation

[rudolfbyker]

What this PR does / why we need it:

Currently, the only place in the docs that port 8443 is mentioned is under the GCE / GKE docs at https://kubernetes.github.io/ingress-nginx/deploy/#gce-gke . This has caused some confusion, e.g. at https://kubernetes.slack.com/archives/CANQGM8BA/p1693290937903399?thread_ts=1693224605.897199&cid=CANQGM8BA . Since port 8443 must always be open between kubernetes nodes for ingress-nginx to work properly, we should add it to the quick-start installation documentation.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

How Has This Been Tested?

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: rudolfbyker / name: Rudolf Byker (58a359b)

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[longwuyuan]

@rudolfbyker thanks for the improvement contribution

/ok-to-test

[longwuyuan]

/kind documentation
/triage accepted
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: longwuyuan, rudolfbyker

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