docs: fix list item format on troubleshooting.md

[able8]

What this PR does / why we need it:

Added empty lines to make sure the list items are rendered correctly.

Before

https://kubernetes.github.io/ingress-nginx/troubleshooting/

After

https://deploy-preview-10552--kubernetes-ingress-nginx.netlify.app/troubleshooting/

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

[netlify]

✅ Deploy Preview for kubernetes-ingress-nginx canceled.

Name	Link
🔨 Latest commit	5d19619
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-ingress-nginx/deploys/653684723816380007d61cbd

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @able8. 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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The committers listed above are authorized under a signed CLA.

• ✅ login: able8 / name: Able Lv (5d19619)

[longwuyuan]

@able8 thanks for the contribution

/ok-to-test

[longwuyuan]

/kind documentation
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: able8, longwuyuan

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Needs approval from an approver in each of these files:

• docs/OWNERS [longwuyuan]

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