Fix rewrite example

[IgorMilavec]

What this PR does / why we need it:

The example for rewriting from https://github.com/kubernetes/ingress-nginx/blob/main/docs/examples/rewrite/README.md did not include nginx.ingress.kubernetes.io/use-regex: "true" and fails to validate when using helm chart 4.5.0.

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

Related to #9616

How Has This Been Tested?

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.
• Added Release Notes.

Does my pull request need a release note?

Any user-visible or operator-visible change qualifies for a release note. This could be a:

• CLI change
• API change
• UI change
• configuration schema change
• behavioral change
• change in non-functional attributes such as efficiency or availability, availability of a new platform
• a warning about a deprecation
• fix of a previous Known Issue
• fix of a vulnerability (CVE)

No release notes are required for changes to the following:

• Tests
• Build infrastructure
• Fixes for unreleased bugs

For more tips on writing good release notes, check out the Release Notes Handbook

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: IgorMilavec / name: Igor Milavec (59dbf03)

[k8s-ci-robot]

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[k8s-ci-robot]

This issue is currently awaiting triage.

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[k8s-ci-robot]

Hi @IgorMilavec. 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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[strongjz]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: IgorMilavec, strongjz

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