docs: Update making plugins.md (#567)

Anson Yu

2023-11-04 aac7b7e97d32580f6a9bd974b8a9068e5218ab9c

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