docs: document tool list changed notifications

[gimseonjin]

Hi! I’m a junior developer based in Korea and I’m interested in MCP, so I wanted to contribute a small documentation update. Thanks for reviewing!

Ref #1132

Summary

• Document server-side tool list changed notifications and manual emit usage
• Add client-side handler example to refresh cached tools
• Clarify where to handle tool list change notifications

Testing

• Not run (docs-only change)

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Latest commit: 8bbab7b

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