doc: fix param type of fs.write

[kt3k]

6-arg version of fs.write doesn't support string as the 2nd arg,
and similarly 5-arg version fs.writeSync doesn't support string
as the 2nd arg. This change removes those unsupported types from
the API docs.

(string type is supported for 5-arg version of fs.write, and 4-arg version of fs.writeSync and those are covered by the next entries)

Examples to support the above claim:

fs.write(process.stdout.fd, Buffer.from([0x61]), 0, 1, null, () => {});
// => prints 'a'
fs.write(process.stdout.fd, "a", 0, 1, null, () => {});
// => throws ERR_INVALID_CALLBACK

[Ayase-252]

Should we consider it as a bug?

[kt3k]

Should we consider it as a bug?

We can't specify the encoding of the string with 6-arg version of fs.write. So it doesn't make sense to support string for the 2nd arg in my view

[aduh95]

I think it's being addressed by #41677?

[kt3k]

@aduh95 Right. #41677 includes this change. Closing this one for now