Fix GitHub pro upgrade flow

[ashis-baral]

Why:

The current documentation contains outdated billing and upgrade instructions that do not match the current GitHub UI.

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

Updated the billing navigation from "Additional billing details" to "Licensing".

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

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
billing/how-tos/manage-plan-and-licenses/downgrade-plan.md	fpt ghec	fpt ghec	from reusable
billing/how-tos/manage-plan-and-licenses/manage-pending-changes.md	fpt ghec	fpt ghec	from reusable
billing/how-tos/manage-plan-and-licenses/upgrade-plan.md	fpt ghec	fpt ghec	from reusable
billing/how-tos/pay-third-parties/cancel-marketplace-app.md	fpt ghec	fpt ghec	from reusable
billing/how-tos/pay-third-parties/cancel-sponsorship.md	fpt ghec	fpt ghec	from reusable
billing/how-tos/pay-third-parties/downgrade-marketplace-app.md	fpt ghec	fpt ghec	from reusable
billing/how-tos/pay-third-parties/upgrade-marketplace-app.md	fpt ghec	fpt ghec	from reusable

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

🤖 This comment is automatically generated.

[Sharra-writes]

@ashis-baral Can I get more details on what you were trying to do? Because "Additional billing details" absolutely does still exist, and this reusable is used in a lot of places. It's unlikely this change would be correct for all of them, so I need to know what you were trying to do so we can consider a more targeted change.

[ashis-baral]

@Sharra-writes Thanks for asking! I tested the GitHub Pro upgrade flow using the steps in the documentation: https://docs.github.com/en/billing/how-tos/manage-plan-and-licenses/upgrade-plan.

On my personal account, when I navigated to Settings → Billing and licensing, I found the Upgrade to GitHub Pro option on the Licensing page. That's why I changed the instructions to point to Licensing.

I also noticed that Additional billing details still exists in the sidebar, so my intention wasn't to say that it had been removed. My goal was only to make the navigation match the GitHub Pro upgrade flow that I tested.

I've attached screenshots showing both the Licensing page (where the upgrade option appears) and the Additional billing details page for context.

[Sharra-writes]

@ashis-baral Thanks! Let me check and see what's going on with this. That reusable may no longer work for that article.