add documentation note about shell expansion

[davidjgoss]

🤔 What's changed?

Improve documentation around paths argument in CLI and shell expansion.

⚡️ What's your motivation?

See #2449.

🏷️ What kind of change is this?

• 📖 Documentation (improvements without changing code)

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

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[coveralls]

coverage: 97.732%. remained the same
when pulling f4429f3 on docs-clarify-glob-behaviour
into 7624f43 on main.