Fix urls describing why NIOFS is not recommended for Windows

[YeonghyeonKO]

Description

• Lucene decides to open segment files whether JRE_IS_64BIT is true or false as below:

  public static FSDirectory open(Path path, LockFactory lockFactory) throws IOException {
    if (Constants.JRE_IS_64BIT) {
      return new MMapDirectory(path, lockFactory);
    } else {
      return new NIOFSDirectory(path, lockFactory);
    }
  }

• In FSDirectory.java and NIOFSDirectory.java, there are url links describing why NIOFSDirectory is not appropriate way to open file only for Windows. Unfortunately these have no longer been valid url, so I fixed them in this PR.

[danmuzi]

Thanks for your patch! 👍

[danmuzi]

Let's include this patch in Lucene 10.2.0 :)
(Merge into the main -> cherry-pick to the branch_10x)
Lucene 11 is a long way from being released.

[YeonghyeonKO]

@danmuzi Thanks for reviewing my PR. I fixed CHANGES.txt to include in Lucene 10.2