fix(prompt): update role syntax in multi-msg prompt for consistency

[sahdev77]

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Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)
• Docs updated (updated docs or a docs bug required)

[gemini-code-assist]

Summary of Changes

Hello @sahdev77, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a minor but important consistency issue within the prompt definitions. It updates the role syntax in a sample multi-message prompt file, replacing an older templating style with a newer, standardized format. This ensures that all prompt definitions adhere to a uniform syntax, improving readability and maintainability for developers working with these prompts.

Highlights

• Prompt Syntax Update: The syntax for defining roles (system and user) within the multi-msg.prompt sample file has been updated to ensure consistency with the new <<<dotprompt:role:...>>> format.
• Consistency Improvement: This change standardizes the prompt role definition, moving from the older {{ role "..." }} syntax to the more current <<<dotprompt:role:...>>> syntax.

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Code Review

This pull request updates the role syntax in go/samples/prompts/prompts/multi-msg.prompt to the <<<dotprompt:role:...>>> format for consistency. The change is correct and improves standardization. However, I've identified that TestMultiMessagesPrompt in go/ai/prompt_test.go still utilizes the old {{ role "..." }} syntax. I recommend updating this test to use the new syntax to ensure complete test coverage and maintain consistency across the codebase. It would also be valuable to verify if other samples and tests in the repository, including those for other languages, need a similar update.