Update Copilot quickstart heading from 'Introduction' to 'Overview'

[hubwriter]

Updates the heading in the GitHub Copilot quickstart documentation from 'Introduction' to 'Overview' as requested. This change makes the documentation more consistent with modern documentation standards.

Changes:

• Updated heading in content/copilot/get-started/quickstart.md from '## Introduction' to '## Overview'

This is a minimal change that only affects the heading text and maintains all existing content and functionality.

[Copilot]

Pull Request Overview

This PR updates the heading in the GitHub Copilot quickstart documentation from "Introduction" to "Overview" to align with modern documentation standards and improve consistency across the docs site.

• Updated the section heading from "## Introduction" to "## Overview" in the quickstart guide

[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/get-started/quickstart.md	fpt ghec	fpt ghec

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

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[hubwriter]

Just testing creating a PR from the new Copilot CLI.