Update proxy authentication instructions for VS

[juihanamshet1]

Instructions for COPILOT_USE_DEFAULTPROXY

Why:

Closes:

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

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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Source	Review	Production	What Changed
copilot/how-tos/configure-personal-settings/configure-network-settings.md	fpt ghec	fpt ghec

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

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[Copilot]

Pull Request Overview

This PR updates the proxy authentication instructions for Visual Studio users of GitHub Copilot by adding information about the COPILOT_USE_DEFAULTPROXY environment variable. The change provides an additional authentication method alongside the existing credential-in-URL approach.

Key changes:

• Adds documentation for the COPILOT_USE_DEFAULTPROXY environment variable as an authentication option
• Restructures the authentication instructions into a numbered list format
• Maintains the existing credential-in-URL method as an alternative

[noellelc]

lgtm!

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