doc: clarify that fs.create{Read,Write}Stream support AbortSignal

Refs: #36431
PR-URL: #47122
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: aduh95

doc/api/fs.md

@@ -2314,6 +2314,9 @@ changes:
  - version: v16.10.0
  pr-url: https://github.com/nodejs/node/pull/40013
  description: The `fs` option does not need `close` method if `autoClose` is `false`.
+ - version: v15.5.0
+ pr-url: https://github.com/nodejs/node/pull/36431
+ description: Add support for `AbortSignal`.
  - version:
  - v15.4.0
  pr-url: https://github.com/nodejs/node/pull/35922
@@ -2360,6 +2363,7 @@ changes:
  * `end` {integer} **Default:** `Infinity`
  * `highWaterMark` {integer} **Default:** `64 * 1024`
  * `fs` {Object|null} **Default:** `null`
+ * `signal` {AbortSignal|null} **Default:** `null`
 * Returns: {fs.ReadStream}
 
 Unlike the 16 KiB default `highWaterMark` for a {stream.Readable}, the stream
@@ -2439,6 +2443,9 @@ changes:
  - version: v16.10.0
  pr-url: https://github.com/nodejs/node/pull/40013
  description: The `fs` option does not need `close` method if `autoClose` is `false`.
+ - version: v15.5.0
+ pr-url: https://github.com/nodejs/node/pull/36431
+ description: Add support for `AbortSignal`.
  - version:
  - v15.4.0
  pr-url: https://github.com/nodejs/node/pull/35922
@@ -2481,6 +2488,7 @@ changes:
  * `emitClose` {boolean} **Default:** `true`
  * `start` {integer}
  * `fs` {Object|null} **Default:** `null`
+ * `signal` {AbortSignal|null} **Default:** `null`
 * Returns: {fs.WriteStream}
 
 `options` may also include a `start` option to allow writing data at some