misleading annotation for aws internal load balancer

[fbreckle]

Problem:
The annotation for internal load balancers on AWS has the value 0.0.0.0/0 for no apparent reason. A cidr range is not required nor supported as a value in this annotation. This is quite confusing.

The implementation at aws.go makes internal load balancers for every value except "false", so "true" has the same effect as 0.0.0.0/0 but is much more intuitive.

Proposed Solution:
Change
service.beta.kubernetes.io/aws-load-balancer-internal: 0.0.0.0/0 to service.beta.kubernetes.io/aws-load-balancer-internal: "true"

Due to the CLA, I cannot create a merge request myself.

Page to Update:
https://kubernetes.io/docs/concepts/services-networking/service/#internal-load-balancer

[thecrudge]

/good-first-issue

Ref #15576 - May need to speak about this, and others like it, in reference to this ticket.

[k8s-ci-robot]

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In response to this:

/good-first-issue

Ref #15576

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