docs: improve Node REPL dot commands explanation

[zZMoZz]

• Group .clear and .break together as equivalent in default REPL
• Simplify descriptions of dot commands
• Clarify that .clear only resets context in custom programmatic REPL

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nodejs-learn	Ready	Preview	May 13, 2026 9:40am

[cursor]

PR Summary

Low Risk
Documentation-only edits with no runtime or API changes; risk is limited to potential inaccuracies in the REPL command descriptions.

Overview
Updates the Node.js REPL “Dot commands” documentation to simplify and reword the command descriptions, including grouping .break and .clear together for multiline-exit behavior.

Adds an explicit note that .clear fully resets REPL context only for custom, programmatically created REPL instances (with a short require('repl').start() example).

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[github-actions]

👋 Codeowner Review Request

The following codeowners have been identified for the changed files:

Team reviewers: @nodejs/repl

Please review the changes when you have a chance. Thank you! 🙏