Fix copilot_gemini_25_pro table header

[DenisMkS]

Why:

Copy/Paste issue in Table header for Gemini 2.5 Pro

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

Fixed table header for Gemini 2.5 Pro

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.

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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 the review server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
copilot/using-github-copilot/ai-models/choosing-the-right-ai-model-for-your-task.md	fpt ghec	fpt ghec

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

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[Sharra-writes]

Thank you for opening this PR! 💛 We've got an earlier PR that makes the same fix and is just waiting on a buggy check getting fixed before I can merge, so I'm going to close this one. But the help is very much appreciated!