OCPBUGS-31432: Added user-managed LB prereq to said documents

[dfitzmau]

Version(s):
4.16+

Issue:
OCPBUGS-31432

Link to docs preview:

• Autoscaling an Ingress Controller
• Scaling an Ingress Controller

• SME has approved this change (Christian Passarelli).
• QE has approved this change (Hongan Li).

[openshift-ci-robot]

@dfitzmau: This pull request references Jira Issue OCPBUGS-31432, which is invalid:

• expected the bug to target the "4.21.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

Version(s):
4.16+

Issue:
[OCPBUGS-31432]https://issues.redhat.com/browse/OCPBUGS-31432)

Link to docs preview:

• SME has approved this change.
• QE has approved this change.

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[ocpdocs-previewbot]

🤖 Tue Nov 25 15:47:16 - Prow CI generated the docs preview:

https://102959--ocpdocs-pr.netlify.app/openshift-dedicated/latest/networking/networking_operators/ingress-operator.html
https://102959--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/networking_operators/ingress-operator.html
https://102959--ocpdocs-pr.netlify.app/openshift-rosa-hcp/latest/networking/networking_operators/ingress-operator.html
https://102959--ocpdocs-pr.netlify.app/openshift-rosa/latest/networking/networking_operators/ingress-operator.html

[openshift-ci]

@dfitzmau: all tests passed!

Full PR test history. Your PR dashboard.

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