fix(copilot): update edit mode link

[aniruddhaadak80]

Why:

Closes: #46060

The Copilot Chat in an IDE article links its Edit mode entry to #edit-mode-1, but the actual Edit mode heading resolves to #edit-mode. Readers following the mode list are therefore sent to a nonexistent fragment instead of the instructions.

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

• Update the Edit mode link to the existing #edit-mode heading.
• Leave the Agent mode link and all surrounding guidance unchanged.
• Evidence: the internal-link checker reports #edit-mode-1 as a stale anchor in this article.

Testing:

• npm run build (Node.js v24.19.0) - passed.
• npm run lint-content -- --paths content/copilot/how-tos/chat-with-copilot/chat-in-ide.md (Node.js v24.19.0) - passed with no errors.
• npm test -- --no-file-parallelism --maxWorkers=1 src/content-render/tests/render-changed-and-deleted-files.ts (Node.js v24.19.0) - 2 tests passed.
• npm run check-links-internal -- --version free-pro-team@latest --concurrency 32 (Node.js v24.19.0) - 17,044 links checked; the replaced stale fragment is absent from the refreshed report.
• git diff --check - passed.

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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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
copilot/how-tos/chat-with-copilot/chat-in-ide.md	fpt ghec	fpt ghec

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

🤖 This comment is automatically generated.

[subatoi]

Thanks @aniruddhaadak80—I'll get this merged now

[github-actions]

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