Docs: Add instructions for managing organization owners

[Copilot]

Documentation: Add Instructions for Adding Owners to Organizations

This PR adds documentation about how to add owners to an organization, addressing the missing documentation identified in the issue.

Summary of Changes:

• Review existing documentation structure and content
• Add section on adding/removing owners to the manage-read-the-docs-teams.rst guide
• Update the organizations.rst file with a reference to managing owners
• Verify the documentation builds correctly
• Request code review
• Address review feedback: correct UI navigation steps and add permission requirement
• Fix button label to "Invite owner" and add Settings step for removing owners

Files Modified:

1. docs/user/guides/manage-read-the-docs-teams.rst:
   • Added comprehensive instructions for managing organization owners
   • Corrected steps to include Settings → Owners → Invite owner workflow
   • Added note that user must be an owner to add another owner
   • Fixed button label from "Add owner" to "Invite owner"
   • Added Settings step to removing owners workflow for consistency
2. docs/user/commercial/organizations.rst: Updated reference to reflect expanded guide scope

The documentation now provides accurate, step-by-step instructions for adding and removing organization owners.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Docs: add instruction about adding owner to organization</issue_title>
<issue_description>This should be documented in at least https://docs.readthedocs.com/platform/stable/commercial/organizations.html, or maybe have a page like https://docs.readthedocs.com/platform/stable/guides/manage-read-the-docs-teams.html</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Docs: add instruction about adding owner to organization #12759

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[read-the-docs-community]

Documentation build overview

📚 docs | 🛠️ Build #31294969 | 📁 Comparing e44a0aa against latest (86f99d6)

🔍 Preview build

Show files changed (5 files in total): 📝 5 modified | ➕ 0 added | ➖ 0 deleted

File	Status
commercial/organizations.html	📝 modified
guides/manage-read-the-docs-teams.html	📝 modified
guides/managing-maintainers.html	📝 modified
guides/set-up-single-sign-on-saml.html	📝 modified
guides/setup-single-sign-on-google-email.html	📝 modified

[stsewd]

@copilot address feedback.

[Copilot]

@copilot address feedback.

Addressed all feedback in commit e44a0aa.