Update custom instructions to mention Visual Studio support for applyTo

[andysterland]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/copilot/tutorials/customization-library/custom-instructions/your-first-custom-instructions

What part(s) of the article would you like to see updated?

The comment on which Copilot clients support applyTo in custom instructions needs to be updated to reflect Visual Studio support.

Path-specific instructions: Create one or more .instructions.md files with an applyTo field that apply only to specific files or directories. Path-specific instructions are currently supported for Copilot Chat in Visual Studio Code and GitHub Copilot coding agent.

Additional information

Visual Studio doc on applyTo support: https://learn.microsoft.com/en-us/visualstudio/ide/copilot-chat-context?view=visualstudio#use-instructionsmd-files.

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