docs: clarify the join behaviour change in the changelog

[tatomyr]

What/Why/How?

Clarified in the changelog that the join command behaviour changed.

Reference

Related change: #2635.

Testing

Screenshots (optional)

Check yourself

• Code follows the contributing guide
• All new/updated code is covered by tests
• Core code changed? - Tested with other Redocly products (internal contributions only)
• New package installed? - Tested in different environments (browser/node)
• Documentation update has been considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

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Note

Low Risk
Documentation-only change that clarifies a previously shipped join behavior change; no runtime code or dependencies are modified.

Overview
Clarifies the 2.0.5 changelog entry for the join command by adding an explicit warning that the improved server-handling behavior may break workflows relying on root-level server inheritance.

Applies the same note to both the public docs changelog (docs/@v2/changelog.md) and the package changelog (packages/cli/CHANGELOG.md).

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Status	Category	Percentage	Covered / Total
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🔵	Statements	79.11% (🎯 78%)	6813 / 8611
🔵	Functions	82.96% (🎯 82%)	1344 / 1620
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[github-actions]

CLI Version	Mean Time ± Std Dev (s)	Relative Performance (Lower is Faster)
cli-latest	3.410s ± 0.031s	▓ 1.00x
cli-next	3.402s ± 0.013s	▓ 1.00x (Fastest)