chore: Clarify copied agent setup prompt text

[MattieTK]

Summary

Updates the prompt string that the agent-setup landing page copies to the clipboard. The old text (Fetch <url>) only told the agent to fetch the URL; the new text instructs it to fetch and execute the setup instructions, which is clearer about the intended action across different coding agents.

[cloudflare-docs-bot]

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
*.ts	@cloudflare/content-engineering, @kodster28

[github-actions]

Preview URL: https://778333e1.preview.developers.cloudflare.com
Preview Branch URL: https://docs-update-agent-setup-prompt-text.preview.developers.cloudflare.com