Add mention of JetBrains IDEs in changing AI models

[rakleed]

Why:

Closes: #36305

What's being changed (if available, include any code snippets, screenshots, or gifs):

Add mention of JetBrains IDEs in changing AI models, also add absent text and unify it

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Source	Review	Production	What Changed
copilot/using-github-copilot/ai-models/changing-the-ai-model-for-copilot-chat.md	fpt ghec	fpt ghec
copilot/using-github-copilot/ai-models/using-gemini-in-github-copilot.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

🤖 This comment is automatically generated.

[rakleed]

And a side note: I couldn't find any mention of Claude 3.7 Sonnet Thinking, probably need to raise an issue for it.

[subatoi]

Thanks for raising this, @rakleed! We'll review it as soon as we can

[subatoi]

Many thanks @rakleed, and thank you for your patience

We really appreciate you taking the time to submit these changes—I'm happy to approve and merge this, but we just need to make a few style-based edits first. If you'd rather that I take these in-house and credit you as co-committer, rather than you going through them, that's fine, just let me know

Thanks again!

[rakleed]

@subatoi sorry for the late reply, but now I resolve your suggestions.

[Copilot]

Pull Request Overview

This PR adds a mention of JetBrains IDEs to the Gemini section and updates the headers and instructions in the AI model switching documentation for consistency and clarity.

• Added a bullet item for JetBrains IDEs in the usage page for Gemini.
• Updated header titles (removing "your") and clarified instructions in the AI model switching documentation.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
content/copilot/using-github-copilot/ai-models/using-gemini-in-github-copilot.md	Added bullet for JetBrains IDEs to mention support for that platform
content/copilot/using-github-copilot/ai-models/changing-the-ai-model-for-copilot-chat.md	Updated header texts and refined instructions for improved clarity and consistency

Comments suppressed due to low confidence (1)

content/copilot/using-github-copilot/ai-models/changing-the-ai-model-for-copilot-chat.md:181

• [nitpick] The text CURRENT-MODEL appears to be a hard-coded placeholder. Consider verifying whether a dynamic variable or a clear label is intended for clarity in production.

1. In the bottom right of the chat view, select an AI model of your choice from the **CURRENT-MODEL** {% octicon "chevron-down" aria-hidden="true" aria-label="chevron-down" %} dropdown menu.