Remove html tag escaping in chapter-single-definition.tmpl

[robert-cronin]

This PR is part of a two-PR solution to address issue #35712: Code blocks not rendering properly in API Documentation (Quantity).

Current problem:
The Quantity description in the Kubernetes API documentation contains a code block that is not being rendered correctly. Instead of proper formatting, the code is displayed as a single line, making it difficult to read and understand.

Proposed solution:
This PR, along with a companion PR in the kubernetes-sigs/reference-docs repository, aims to improve the rendering of code blocks within the API documentation, specifically targeting the Quantity resource description.

Current status:

1. I've added a basic working example for the approach in the kubernetes-sigs/reference-docs repo.
2. This PR complements that change by removing an escaping operator for the Description field.

Known limitation:
The following lines are still rendered on a single line due to newline characters not being captured in the Swagger JSON:

// <digit>           ::= 0 | 1 | ... | 9
// <digits>          ::= <digit> | <digit><digits>
// <number>          ::= <digits> | <digits>.<digits> | <digits>. | .<digits>
// <sign>            ::= "+" | "-"
// <signedNumber>    ::= <number> | <sign><number>
// <suffix>          ::= <binarySI> | <decimalExponent> | <decimalSI>
// <binarySI>        ::= Ki | Mi | Gi | Ti | Pi | Ei

Seeking feedback:
I'm looking for input on whether this approach is the right direction to solve the issue. Specifically:

1. Is the proposed solution addressing the root cause of the rendering problem?
2. Are there any potential side effects or considerations I should be aware of?
3. How should we address the remaining issue with newline characters in the Swagger JSON?

Screenshots:

Companion PRs:
kubernetes-sigs/reference-docs#365

Any feedback or suggestions for improvement are greatly appreciated. Thank you for your time and input!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign divya-mohan0209 for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS
• content/en/docs/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[netlify]

✅ Pull request preview available for checking

Built without sensitive environment variables

Name	Link
🔨 Latest commit	d91fa4c
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-io-main-staging/deploys/66966040384f5f0009832160
😎 Deploy Preview	https://deploy-preview-47089--kubernetes-io-main-staging.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[sftim]

I think the fix to the OpenAPI generation (preserving newlines) should happen in k/k

[Jefftree]

I think the fix to the OpenAPI generation (preserving newlines) should happen in k/k

+1, more specifically in the OpenAPI generation most likely in k/kube-openapi. That only solves 3 though, so this PR and kubernetes-sigs/reference-docs#365 are still necessary to make everything fit together.

[k8s-ci-robot]

PR needs rebase.

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-sigs/prow repository.