doc: fix type in stream doc · nodejs/node@5e46c16

nodejs

Original file line number	Diff line number	Diff line change
`@@ -954,7 +954,7 @@ added: v0.9.4`
`954`	`954`	`-->`
`955`	`955`
`956`	`956`	* `size` {number} Optional argument to specify how much data to read.
`957`		`-* Returns: {string\|Buffer\|null}`
	`957`	`+* Returns: {string\|Buffer\|null\|any}`
`958`	`958`
`959`	`959`	The `readable.read()` method pulls some data out of the internal buffer and
`960`	`960`	returns it. If no data available to be read, `null` is returned. By default,