doc: add Buffer#subarray() and add note about Uint8Array#slice()

doc/api/buffer.md

@@ -1977,7 +1977,9 @@ offset and cropped by the `start` and `end` indices.
 
 This is the same behavior as `buf.subarray()`.
 
-Note that this method is not compatible with the `Uint8Array#slice()`, which is a superclass of `Buffer`. If a copy of slice is needed, use `Uint8Array.prototype.slice` directly.
+Note that this method is not compatible with the `Uint8Array.prototype.slice()`,
+which is a superclass of `Buffer`. If a copy of the slice is needed, use
+`Uint8Array.prototype.slice` directly.
 
 ```js
 const buf = Buffer.from('buffer');