doc: update buffer.constants.MAX_LENGTH size

Starting from Node v22.0.0 the `buffer.constants.MAX_LENGTH` has been
increased from 4 GiB to 8 PiB due to V8 engine update to 12.4.254.14.

PR-URL: #54207
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/buffer.md

@@ -5361,6 +5361,10 @@ added: v8.2.0
 <!-- YAML
 added: v8.2.0
 changes:
+  - version: v22.0.0
+    pr-url: https://github.com/nodejs/node/pull/52465
+    description: Value is changed to 2<sup>53</sup> - 1 on 64-bit
+      architectures.
   - version: v15.0.0
     pr-url: https://github.com/nodejs/node/pull/35415
     description: Value is changed to 2<sup>32</sup> on 64-bit
@@ -5376,7 +5380,7 @@ changes:
 On 32-bit architectures, this value currently is 2<sup>30</sup> - 1 (about 1
 GiB).
 
-On 64-bit architectures, this value currently is 2<sup>32</sup> (about 4 GiB).
+On 64-bit architectures, this value currently is 2<sup>53</sup> - 1 (about 8 PiB).
 
 It reflects [`v8::TypedArray::kMaxLength`][] under the hood.