Clarify billing cycle options for Copilot and GitHub plans

[kellikellikelli]

Updated instructions to include GitHub plans for billing cycle changes.

The previous doc for changing a GitHub billing cycle duration has been deleted but the content is still relevant and needed:

https://docs.github.com/billing/managing-your-github-billing-settings/changing-the-duration-of-your-billing-cycle

Why: Customers ask how to change their GitHub billing cycle and there is no corresponding doc since the previous one was deleted.

Closes: #40608, https://github.com/github/docs-content/issues/18387

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

Adds a mention of GitHub billing plans to make it more inclusive.

Alternatively, it would be helpful to bring back the original doc that used to live here:

Changing the duration of your billing cycle

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.

[welcome]

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[Copilot]

Pull Request Overview

This pull request clarifies billing cycle change instructions to include both Copilot and GitHub plans, addressing customer confusion after a previous billing cycle documentation was deleted. The changes make the billing cycle documentation more inclusive by expanding the scope beyond just Copilot plans.

• Updated billing cycle section to include GitHub plans alongside Copilot plans
• Made instructions more generic to apply to both plan types

[Copilot]

The phrase 'designated plan section' is vague and unclear. Since this article covers both Copilot and GitHub plans now, it would be more helpful to specify 'In the plan section (such as 'GitHub Copilot' or your GitHub plan section)' or provide clearer guidance on how users can identify the correct section.

Suggested change

	1. In the designated plan section, select the **Edit** dropdown on the right.
	1. In the plan section (such as "GitHub Copilot" or your GitHub plan section), select the **Edit** dropdown on the right.

[github-actions]

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Table of review links

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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/manage-your-account/view-and-change-your-copilot-plan.md	fpt ghec	fpt ghec

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

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[Sharra-writes]

I'm going to go ahead and close this so that a PR can be opened internally after a discussion about the placement of this info.