Fix hyphens in cloud sandbox command

[ashis-baral]

Why:

fix: #46370

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

Fixed incorrect hyphens in the cloud sandbox command in the GitHub Docs article.

Replaced Unicode non-breaking hyphens (‑) with standard ASCII hyphens (-) so users can copy and paste the command into their terminals correctly.

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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Table of review links

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Source	Review	Production	What Changed
copilot/concepts/security-governance-and-network-settings/about-cloud-and-local-sandboxes.md	fpt ghec	fpt ghec

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

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