Fix typo Update message.md

[VitalikBerashvili]

Details of the Fix:
Original text: "trucated"
Corrected text: "truncated"
Explanation:
The word "trucated" was misspelled and corrected to "truncated."
This ensures clarity and correctness in the inline documentation, especially in technical contexts where precision is critical.
Change Summary:
File affected: docs/reference/hubble/httpapi/message.md
Lines affected: Line 196
Number of changes: One deletion (incorrect text) and one addition (corrected text).

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PR-Codex overview

This PR focuses on correcting a typo in the documentation related to the calculation of a blake3 hash in the message.md file.

Detailed summary

• Fixed the typo in the comment from "trucated" to "truncated" in docs/reference/hubble/httpapi/message.md.

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