Updating the benchmark README to use diskann-benchmark

[bryantower]

• Does this PR have a descriptive title that could go in our release notes?
• Does this PR add any new dependencies?
• Does this PR modify any existing APIs?
• Is the change to the API backwards compatible?
• Should this result in any changes to our documentation, either updating existing docs or adding new ones?

Reference Issues/PRs

What does this implement/fix? Briefly explain your changes.

The README was just referencing benchmark, but it should say diskann-benchmark
Also updated the location of the test data in one of the example json files.
There may be other locations that need to be updated.

Any other comments?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.70%. Comparing base (528fd06) to head (606a81f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #709   +/-   ##
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  Coverage   86.70%   86.70%           
=======================================
  Files         398      398           
  Lines       74238    74238           
=======================================
  Hits        64371    64371           
  Misses       9867     9867           

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[Copilot]

Pull request overview

This PR updates the diskann-benchmark README documentation to consistently reference the correct package name diskann-benchmark instead of just benchmark in all cargo commands. It also fixes an outdated file path in the disk-index.json example configuration.

Changes:

• Updated all cargo command examples in README.md to use --package diskann-benchmark instead of --package benchmark
• Fixed the load_path in disk-index.json from the old disk-index/tests/data/ directory structure to the current test_data/ structure

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
diskann-benchmark/README.md	Updated 8 cargo command examples to use the correct package name diskann-benchmark
diskann-benchmark/example/disk-index.json	Fixed outdated test data path to match current repository structure

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