docs: add Long description and example to version command

[ogulcanaydogan]

The version command had a Short: description but no Long: or example, unlike most other commands. Add a Long: with a usage example to match the pattern used by other notation commands.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR enhances the notation version CLI help output by adding a long description with an example invocation, improving discoverability for users.

Changes:

• Add Long help text for the version command
• Include an explicit example usage block in the help text

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.12%. Comparing base (51ff5ec) to head (f2965c0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1350      +/-   ##
==========================================
+ Coverage   79.09%   79.12%   +0.02%     
==========================================
  Files          68       68              
  Lines        3076     3080       +4     
==========================================
+ Hits         2433     2437       +4     
  Misses        436      436              
  Partials      207      207              

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[github-actions]

This PR is stale because it has been opened for 45 days with no activity. Remove stale label or comment. Otherwise, it will be closed in 30 days.

[ogulcanaydogan]

Bumping this, still a small doc-only change and CI is green. Happy to adjust if the format doesn't match what you'd prefer.