Remove deprecated & unsupported components related content from docs about ingress-nginx

[k8s-ci-robot]

@longwuyuan:
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In response to this:

What happened:

• There is content in the docs related to components like opentracing and zipkin for example, that are deprecated and removed from the controller
• This Issue is to track removal of such content from docs

/triage accepted
/kind docs
/area documentation
/help

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[k8s-ci-robot]

@longwuyuan: The label(s) kind/docs, area/documentation cannot be applied, because the repository doesn't have them.

In response to this:

What happened:

• There is content in the docs related to components like opentracing and zipkin for example, that are deprecated and removed from the controller
• This Issue is to track removal of such content from docs

/triage accepted
/kind docs
/area documentation
/help

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[longwuyuan]

/kind documentation
/area docs

[longwuyuan]

/priority important-longterm