doc: fix documentation of FileHandle.prototype.appendFile

[aduh95]

FileHandle.prototype.appendFile is an alias of FileHandle.prototype.writeFile, so it should have the same change history and documented supported data types.

node/doc/api/fs.md

Lines 658 to 683 in 80bfb9b

	#### `filehandle.writeFile(data, options)`
	<!-- YAML
	added: v10.0.0
	changes:
	- version:
	- v15.14.0
	- v14.18.0
	pr-url: https://github.com/nodejs/node/pull/37490
	description: The `data` argument supports `AsyncIterable`, `Iterable` and `Stream`.
	- version: v14.12.0
	pr-url: https://github.com/nodejs/node/pull/34993
	description: The `data` parameter will stringify an object with an
	explicit `toString` function.
	- version: v14.0.0
	pr-url: https://github.com/nodejs/node/pull/31030
	description: The `data` parameter won't coerce unsupported input to
	strings anymore.
	-->
	* `data`{string|Buffer|TypedArray|DataView|Object|AsyncIterable|Iterable
	|Stream}
	* `options`{Object|string}
	* `encoding`{string|null} The expected character encoding when `data` is a
	string. **Default:** `'utf8'`
	* Returns:{Promise}

[github-actions]

Fast-track has been requested by @aduh95. Please 👍 to approve.

[nodejs-github-bot]

Landed in ae1f6db