Improve clarity in utilities.adoc

[Pricstas]

Changes:

• Fixed incorrect phrase a 65 byte array → form a 65-byte array.
• Replaced purposely with intentionally for better readability.
• Corrected always store → always stores in the Heap section.
• Fixed incorrect source, solidity syntax to source,solidity.

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

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Latest commit: 09ab487

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