[snapshot] The length of the snapshot version string is 64 bytes

Modify the wrong code annotation.

Change-Id: Ied592d7066f394581ba36480eb91221f1ba53bbc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3359104
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78541}

AUTHORS

@@ -263,3 +263,4 @@ Zhao Jiazhong <kyslie3100@gmail.com>
 Zheng Liu <i6122f@gmail.com>
 Zhongping Wang <kewpie.w.zp@gmail.com>
 柳荣一 <admin@web-tinker.com>
+Yang Xiang <xiangyangemail@gmail.com>

src/snapshot/snapshot.cc

@@ -72,7 +72,7 @@ class SnapshotImpl : public AllStatic {
   // [0] number of contexts N
   // [1] rehashability
   // [2] checksum
-  // [3] (128 bytes) version string
+  // [3] (64 bytes) version string
   // [4] offset to readonly
   // [5] offset to shared heap
   // [6] offset to context 0