Include ThinkingPart in messages.md API documentation graph

[lfloeer]

No description provided.

[hyperlint-ai]

PR Change Summary

Updated messages.md API documentation to include the new ThinkingPart component.

• Added ThinkingPart to the ModelResponsePart section of the API documentation.
• Enhanced the clarity of the messages.md file by including the new component.

Modified Files

• docs/api/messages.md

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[DouweM]

@lfloeer Thanks Lars!