docs: add explorer example for advanced `sortFn` (#564)

Sidney

2023-12-28 e1b6a0014cabf07ddc7e7931912aece471959224

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{
  "printWidth": 100,
  "quoteProps": "as-needed",
  "trailingComma": "all",
  "tabWidth": 2,
  "semi": false
}