Fixup docs for the ingress-class flag.

[mqsoh]

According to this issue, there is no way to handle all ingress classes. This will make the documentation consistent.

#3101

What this PR does / why we need it:

The documentation is misleading.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Which issue/s this PR fixes

None. It was something that confused me.

How Has This Been Tested?

I'm moving from Traefik so all our existing Ingresses had "traefik" as the ingress class (annotation). I removed the --ingress-class from my deployment of Ingress Nginx expecting it to handle all those ingresses, but it doesn't! This change makes the docs consistent.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @mqsoh. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[aledbf]

/ok-to-test

[aledbf]

/lgtm
/approve

[aledbf]

@mqsoh thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, mqsoh

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Needs approval from an approver in each of these files:

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[aledbf]

/retest

[aledbf]

/retest

[mqsoh]

Is this normal or did my change actually break something?

[aledbf]

Is this normal or did my change actually break something?

No, your change is fine. I broke the e2e test 🙃 . I am fixing the issue.

[aledbf]

/retest

[aledbf]

/retest

[aledbf]

/retest

[aledbf]

/retest