Update default Copilot CLI config directory path

[Nao-Mk2]

Why:

Closes:

The documentation stated that the CLI configuration is "located, by default, in the ~/.config directory." However, after installing and using GitHub Copilot CLI on macOS, the actual configuration directory created was ~/.copilot (for example: ~/.copilot/config.json).
This PR updates the wording to reflect the default location observed on macOS, and to reduce confusion for users who look for the file in ~/.config and cannot find it.

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

Updated the sentence in the "Trusted directories" section to correct the default configuration directory from ~/.config to ~/.copilot.

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.

[welcome]

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[Copilot]

Pull Request Overview

This PR corrects documentation about the default configuration directory path for GitHub Copilot CLI. The documentation incorrectly stated that the CLI configuration is located in ~/.config by default, when it's actually located in ~/.copilot on macOS systems.

Key Changes

• Updated the default configuration directory path from ~/.config to ~/.copilot in the trusted directories section

[github-actions]

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Table of review links

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Source	Review	Production	What Changed
copilot/concepts/agents/about-copilot-cli.md	fpt ghec	fpt ghec

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

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[Sharra-writes]

@Nao-Mk2 Thanks for opening a PR! I'm trying to figure out how to validate this one. I feel like I should be able to install it and check, but I'll probably end up reaching out to our SMEs.