Clarify Ingress Operator deployment procedure

[osokin]

Proposed changes

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Checklist

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• [X] I have read the CONTRIBUTING doc
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked that all unit tests pass after adding my changes
• [X] I have updated necessary documentation
• [X] I have rebased my branch onto main
• [X] I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[github-actions[bot]]

This PR is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[github-actions[bot]]

This PR was closed because it has been stalled for 10 days with no activity.