Copilot: Fix Pro+ signup attribution in setup guide

[sbaidon]

Summary

• correct the Copilot Pro+ signup link in the self-setup guide
• use ref_plan=pro-plus instead of attributing Pro+ clicks to pro

Why

The Pro and Pro+ links currently send the same ref_plan=pro value. This can misattribute Pro+ intent and may select the wrong downstream plan context.

Validation

• confirmed the branch changes only the Pro+ tracking parameter
• confirmed the corrected URL preserves ref_plan=pro-plus through the signed-out authentication redirect
• confirmed the Pro and Max links are unchanged

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Table of review links

Note: Please update the URL for your staging server or codespace.

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/how-tos/set-up/set-up-for-self.md	fpt ghec	fpt ghec

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

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[Copilot]

Copilot review overview

🟢 Approval recommended

The targeted URL now matches the established Pro+ signup link without affecting other plans.

Review tier: Balanced
Findings: None

What changed in this PR

Corrects Copilot Pro+ signup attribution in the self-setup guide.

Changes:

• Updates ref_plan from pro to pro-plus.
• Leaves Pro and Max signup links unchanged.

File	Description
content/​copilot/​how-tos/​set-up/​set-up-for-self.md	Corrects the Pro+ signup URL parameter.

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[sbaidon]

Closing this PR and moving the change through the Hubber contribution workflow in the private Docs repository. The proposed one-line correction remains valid; only the contribution path is changing.