fix(gen-apidocs): unescape HTML entities in markdown generator descriptions

[aman0408]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Unescapes HTML entities (such as ", &, <, >) in field and resource descriptions rendered by gen-apidocs/generators/markdown.go.

During configuration loading, OpenAPI descriptions are HTML-escaped into DescriptionWithEntities. While the HTML backend (html.go) relies on web browsers to natively decode these entities when rendering HTML elements (<TD> / <P>), Hugo's Markdown parser (goldmark) emits HTML entities literally when they appear inside Markdown code spans or table cells (e.g. rendering `Name: "mysvc"` on kubernetes.io).

Un-escaping descriptions before generating Markdown pages ensures clean, human-readable text and code blocks across the generated reference pages.

Which issue(s) this PR fixes:

Ref kubernetes/website#56418

Example affected page: Core v1 Endpoints

Does this PR introduce a user-facing change?

NONE

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[kubernetes-prow]

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[Caesarsage]

Thanks for the fix.

LGTM

I verified locally

[aman0408]

@onlydole @divya-mohan0209 friendly ping to review the PR in case you missed it :)