Update VS Code Create Prompt File Instructions

[ashis-baral]

Why:

fIX: #46305

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

Updated the instructions in the Creating prompt files section of the GitHub Copilot documentation to use the current VS Code command name, Chat: New Prompt File, instead of Chat: Create Prompt.

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]

Please don't raise pull requests against an existing issue that another user has raised until it's been marked with a help wanted label. We need to properly assess all issues before we can accept community contributions, and determine whether it's something we need to fix internally, or how many articles are affected and what the scope of the fix will be. For now, we're going to close this pull request.

[github-actions]

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Table of review links

Note: Please update the URL for your staging server or codespace.

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/copilot-in-your-ide/customize-copilot/configure-custom-instructions/add-repository-instructions-in-your-ide.md	fpt ghec	fpt ghec

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

🤖 This comment is automatically generated.

[github-actions]

Please don't raise pull requests against an existing issue that another user has raised until it's been marked with a help wanted label. We need to properly assess all issues before we can accept community contributions, and determine whether it's something we need to fix internally, or how many articles are affected and what the scope of the fix will be. For now, we're going to close this pull request.

[subatoi]

Apologies @ashis-baral, this is valid so I'll make sure this is reopened and reviewed

[ashis-baral]

@subatoi 😊 Yes, I can see you’re trying to reopen it, but it looks like the GitHub Actions bot closed it again.

[subatoi]

Got there in the end. Thank you, @ashis-baral: we'll review this per the normal process 😄