docs: Update showcase.md (#1031)

Xinyang Yu

2024-03-24 85a737b4ee72fb4dba12e1aacbd87d1636cfc30e

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export const escapeHTML = (unsafe: string) => {
  return unsafe
    .replaceAll("&", "&")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;")
    .replaceAll("'", "&#039;")
}