Fixing some typos in the model selectors

[Giom-V]

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[gemini-code-assist]

Summary of Changes

Hello @Giom-V, 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 focuses on minor but important corrections across several example and quickstart files. It addresses textual typos, improves code formatting, and standardizes a variable name, all contributing to enhanced code clarity and correctness for users interacting with these examples.

Highlights

• Typo Fix in Barista Bot Prompt: An extraneous backslash character was removed from the beginning of the COFFEE_BOT_PROMPT string in the Barista Bot example, and consistent indentation was applied to the prompt's content.
• Model Selector Variable Renaming: The variable used for selecting the model in the Barista Bot example was renamed from model_name to MODEL_ID for improved consistency with common naming conventions.
• JavaScript Quickstart Comment Corrections: Typographical errors, specifically missing commas, were corrected within the model selector comments in three JavaScript quickstart files (Audio.js, File_API.js, Get_Started.js).

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[gemini-code-assist]

Code Review

This pull request fixes some typos in model selector comments and improves variable naming and string formatting in the Python notebook to align with the style guide. The changes are good and improve code quality. I've added a few suggestions for the JavaScript files to declare constants properly, which is a best practice to avoid implicit global variables. I also noticed that quickstarts-js/Counting_Tokens.js has the same typo and implicit global issue as the other JS files; you might want to include a fix for that file in this PR for consistency.

[gemini-code-assist]

While this code works, it's creating an implicit global variable, which is generally considered bad practice in JavaScript as it can lead to unexpected behavior and conflicts. It's better to declare your variables with const, let, or var.

const MODEL_ID = "gemini-2.5-flash" // "gemini-2.5-flash-lite", "gemini-2.5-flash", "gemini-2.5-pro", "gemini-3-flash-preview", "gemini-3-pro-preview"

[gemini-code-assist]

To avoid creating an implicit global variable, it's best practice to declare MODEL_ID using const. This makes the code safer and more predictable.

const MODEL_ID = "gemini-2.5-flash" // "gemini-2.5-flash-lite", "gemini-2.5-flash", "gemini-2.5-pro", "gemini-3-flash-preview", "gemini-3-pro-preview"

[gemini-code-assist]

It's recommended to declare MODEL_ID with const to prevent it from becoming an implicit global variable. This is a standard JavaScript best practice for maintainability and avoiding potential bugs.

const MODEL_ID = "gemini-2.5-flash" // "gemini-2.5-flash-lite", "gemini-2.5-flash", "gemini-2.5-pro", "gemini-3-flash-preview", "gemini-3-pro-preview"