Update billing managers' abilities in documentation

[Tajaly]

Removed mention of 'User licenses' from billing managers' abilities.

Why:

Only Enterprise Owners or Organization Owners have the ability to manage Github Copilot Licenses.

Closes:

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

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.

[github-actions]

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Source	Review	Production	What Changed
admin/managing-accounts-and-repositories/managing-roles-in-your-enterprise/abilities-of-roles.md	ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14	ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14

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

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[Copilot]

Pull request overview

Updates the enterprise roles reference page to adjust what “Billing managers” are documented as being able to manage in enterprise billing settings.

Changes:

• Removes “User licenses” from the list of billing settings that billing managers can view and manage.

[Copilot]

Removing “User licenses” from the billing manager abilities list makes this section inconsistent with other docs that state enterprise billing managers can manage GitHub user licenses (seats) for self-serve volume licensing. Consider restoring this bullet (and, if the intent is to clarify Copilot licensing specifically, adjust the text to distinguish GitHub plan licenses from Copilot subscriptions/seat assignment rather than removing license management entirely).

Suggested change

	* {% data variables.product.github %} user licenses for self-serve volume licensing