cors-allow-origin annotation bad docs

[Mikhail-93]

Config from example in docs smells bad:
In your example(its not working):
nginx.ingress.kubernetes.io/cors-allow-origin: "https://origin-site.com:4443, http://origin-site.com, myprotocol://example.org:1199"

Working option:
nginx.ingress.kubernetes.io/cors-allow-origin: https://origin-site.com:4443 http://origin-site.com myprotocol://example.org:1199

[k8s-ci-robot]

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[longwuyuan]

cc @elizabeth-dev

[Gacko]

We have a PR open for this, we just didn't manage to review and merge it, yet, as it also requires adding the NJS module. However, this is a duplicate of #10267, so I'm going to close this issue here.