Update billing_plans.md

[KennedyIDK]

Updated sidebar headings to match new layout of https://github.com/settings/

Why:

Closes: #37120

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

Headings referred to in billing_plans.md updated to reflect new headings on https://github.com/settings/.

Billing and plans > Billing and Licensing
Plans and usage > 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.

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[Copilot]

Pull Request Overview

This PR updates sidebar headings in billing_plans.md to reflect the new layout on GitHub settings.

• Updated the "Billing and plans" heading to "Billing and Licensing".
• Updated the "Plans and usage" heading to "Licensing".

[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 the review server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
billing/managing-billing-for-your-products/managing-billing-for-git-large-file-storage/downgrading-git-large-file-storage.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-git-large-file-storage/upgrading-git-large-file-storage.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-git-large-file-storage/viewing-your-git-large-file-storage-usage.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-github-actions/viewing-your-github-actions-usage.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-github-codespaces/viewing-your-github-codespaces-usage.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-github-marketplace-apps/canceling-a-github-marketplace-app.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-github-marketplace-apps/downgrading-the-billing-plan-for-a-github-marketplace-app.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-github-marketplace-apps/upgrading-the-billing-plan-for-a-github-marketplace-app.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-github-packages/managing-your-spending-limit-for-github-packages.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-github-packages/viewing-your-github-packages-usage.md	fpt ghec	fpt ghec	from reusable
billing/managing-billing-for-your-products/managing-billing-for-github-sponsors/downgrading-a-sponsorship.md	fpt ghec	fpt ghec	from reusable
billing/managing-the-plan-for-your-github-account/downgrading-your-accounts-plan.md	fpt ghec	fpt ghec	from reusable
billing/managing-the-plan-for-your-github-account/upgrading-your-accounts-plan.md	fpt ghec	fpt ghec	from reusable
billing/managing-the-plan-for-your-github-account/viewing-and-managing-pending-changes-to-your-plan.md	fpt ghec	fpt ghec	from reusable
billing/using-the-billing-platform/adding-or-editing-a-payment-method.md	fpt ghec	fpt ghec	from reusable
billing/using-the-billing-platform/changing-the-duration-of-your-billing-cycle.md	fpt ghec	fpt ghec	from reusable
billing/using-the-billing-platform/viewing-your-subscriptions-and-billing-date.md	fpt ghec	fpt ghec	from reusable
copilot/managing-copilot/managing-copilot-as-an-individual-subscriber/managing-your-github-copilot-pro-subscription/canceling-copilot-pro-as-an-individual-user.md	fpt ghec	fpt ghec	from reusable
copilot/managing-copilot/managing-copilot-as-an-individual-subscriber/managing-your-github-copilot-pro-subscription/canceling-your-copilot-pro-trial-as-an-individual-user.md	fpt ghec	fpt ghec	from reusable
copilot/managing-copilot/managing-copilot-as-an-individual-subscriber/managing-your-github-copilot-pro-subscription/modifying-your-copilot-pro-subscription-as-an-individual-user.md	fpt ghec	fpt ghec	from reusable

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

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[Sharra-writes]

@KennedyIDK Thanks so much for opening a PR! I'll get this triaged for review.

[Sharra-writes]

Closing this as mentioned in issue #37120.