[Doc] Worker node security groups selection

[yyyoungha]

Is your feature request related to a problem? Worker node security groups selection is only mentioned under the /docs/guide/service/ path. However, I have found through testing that this works the same in Ingress.

The path to which this document is located may lead one to misunderstand that this only applies to Services and not Ingress.

Describe the solution you'd like Worker node security groups selection is the same in Ingress, so this content should also be included in the Ingress guide.

Describe alternatives you've considered Since it applies to both Ingress and Service, it would also be a good to create a separate folder under the /docs/guide path and explain how LBC detects security groups and add rules.