Bug in tsc: can't use `@function ...` (must use `@callback ...`)

See https://github.com/microsoft/TypeScript/issues/50274

## ❌ Invalid for `tsc`: `@typedef {Function}`

```js
/**
* @typedef {Function} PersonGreet
* @param {String} name - other's name
* @returns {String} - the greeting
*/
```

```js
/**
* @function PersonGreet
* @param {String} name - other's name
* @returns {String} - the greeting
*/
```

## ⚠️ Workaround: `@callback`

It's confusing, but it's our option.

```js
/**
* @callback PersonGreet
* @param {String} name - other's name
* @returns {String} - the greeting
*/
```