docs: document wheel pack --local-version

[hxperl]

wheel pack --help lists --local-version; docs/reference/wheel_pack.rst does not. #694 added the option and a news entry, but never touched the reference page.

$ wheel pack --help
usage: wheel pack [-h] [--dest-dir DEST_DIR] [--build-number BUILD_NUMBER]
                  [--local-version LOCAL_VERSION]
                  directory

Checked the wording against the behaviour: --local-version=foo gives demo-1.0+foo-py3-none-any.whl, --local-version="" gives demo-1.0-py3-none-any.whl. Docs build adds no new warning; pytest 74 passed.

Not bundled, happy to send separately: wheel_convert.rst omits -v/--verbose, and its failure example shows an error string the command cannot actually produce — but which output you'd rather document there is your call, not mine.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.45%. Comparing base (b25c3c2) to head (e070c6a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #699   +/-   ##
=======================================
  Coverage   63.45%   63.45%           
=======================================
  Files          15       15           
  Lines        1267     1267           
=======================================
  Hits          804      804           
  Misses        463      463           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[agronholm]

Looks good. The only thing that caught my eye is that last part about passing an empty string. The --build-number option works the same way, and that doesn't have any matching text there. This feels odd, and maybe we should fix both for the sake of consistency. Also, perhaps it would be good to explain how to pass an empty string on the command line?

[agronholm]

And yes, I would accept another PR for wheel convert.