[orkirson]

Summary

Chapter 14.3 incorrectly states that Cargo workspace crates must be published separately.

This PR updates the documentation to clarify that:

• Each crate is published as a separate package.
• A specific crate can be published using the -p flag.
• All workspace members can be published using cargo publish --workspace.

Verification

• Compared the updated guidance against the official Cargo publish documentation.
• Confirmed that the change affects only src/ch14-03-cargo-workspaces.md.
• This is a documentation-only change. No application code was modified or executed.

AI Assistance

I used ChatGPT (GPT-6) to help identify the documentation issue, review the wording, and prepare this pull request description. I reviewed the proposed change and checked the command against the official Cargo documentation.

Fixes #4868.