Add workaround for when organization’s active sponsorships are canceled after joining an enterprise with Azure billing

[ernest-phillips]

Why:

Closes https://github.com/github/sponsors/issues/6228

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

This PR updates the documentation for adding an existing organization to an enterprise, specifically addressing the impact on GitHub Sponsors when the enterprise uses Azure billing. It adds clear guidance for organizations whose sponsorships are canceled during this process and provides a workaround so they can continue to use GitHub Sponsors.

Problem

When an existing organization is added to an enterprise account with Azure metered billing, all active GitHub Sponsors sponsorships are canceled. Organizations are unable to reactivate sponsorships or add a payment method due to enterprise billing restrictions, and current documentation does not provide clear next steps for affected organizations.

Solution

This PR adds a new subsection to the “Changes when adding an existing organization” section. It explains why sponsorships are canceled, clarifies that reactivation is not possible under Azure billing, and recommends creating a standalone "shell" organization to manage sponsorships outside the enterprise billing structure.

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.
  Here’s a draft for your pull request description:

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Checklist

• Added new guidance for GitHub Sponsors and Azure billing scenario
• Provided a workaround for affected organizations
• Updated documentation structure for clarity

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Pull Request Overview

This PR fixes linting issues with headings and improves documentation for organizations being added to enterprises with Azure billing. The changes primarily address GitHub Sponsors compatibility issues when organizations join enterprises using Azure metered billing.

• Adds comprehensive guidance for handling GitHub Sponsors cancellations under Azure billing
• Provides a workaround using "shell" organizations for continued sponsorship management
• Fixes punctuation formatting in step-by-step instructions

Comments suppressed due to low confidence (1)

content/admin/managing-accounts-and-repositories/managing-organizations-in-your-enterprise/adding-organizations-to-your-enterprise.md:74

• This line uses 'GitHub Sponsors' instead of the defined variable. According to the content guidelines, you should use {% data variables.product.prodname_sponsors %} instead of hardcoded text for product names.

To continue using GitHub Sponsors, create a new, separate "shell" organization that is not linked to your enterprise account or Azure billing. You can then use this shell organization to manage sponsorships independently of your enterprise’s billing setup.

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Source	Review	Production	What Changed
admin/managing-accounts-and-repositories/managing-organizations-in-your-enterprise/adding-organizations-to-your-enterprise.md	ghec	ghec

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

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[ernest-phillips]

Place comma inside the quotation marks
https://owl.purdue.edu/owl/general_writing/punctuation/quotation_marks/more_quotation_mark_rules.html