Docs: Fix link in installation instructions.

[lemeurherveCB]

This PR updates the broken link https://kubernetes.github.io/ingress-nginx/#how-to-easily-install-multiple-instances-of-the-ingress-nginx-controller-in-the-same-cluster to the page describing how to install multiple Ingress controllers in the same cluster: https://kubernetes.github.io/ingress-nginx/user-guide/multiple-ingress/

What this PR does / why we need it:

The link to install multiple controllers is broken, you have to dig in the documentation to find the corresponding article.

The only reference I found online with the initial title is https://www.linkedin.com/pulse/how-easily-install-multiple-instances-ingress-nginx-controller-kumar-1f, which is more or less the same content as in https://kubernetes.github.io/ingress-nginx/user-guide/multiple-ingress/.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

How Has This Been Tested?

N/A

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

[linux-foundation-easycla]

• ✅login: lemeurherveCB / (f47419f)

The committers listed above are authorized under a signed CLA.

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[Gacko]

/retitle Docs: Fix link in installation instructions.
/triage accepted
/kind documentation
/priority backlog
/lgtm

[Gacko]

/cherry-pick release-1.12

[Gacko]

/cherry-pick release-1.11

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/cherry-pick release-1.12

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[k8s-infra-cherrypick-robot]

@Gacko: once the present PR merges, I will cherry-pick it on top of release-1.11 in a new PR and assign it to you.

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/cherry-pick release-1.11

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Gacko, lemeurherveCB

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[k8s-infra-cherrypick-robot]

@Gacko: new pull request created: #13192

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/cherry-pick release-1.12

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[k8s-infra-cherrypick-robot]

@Gacko: new pull request created: #13193

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/cherry-pick release-1.11

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