Fix 'OAuth app policy' menu description

[akordowski]

Why:

The description does not match the menu description.

Closes: #35520

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

The icon and the description has been changed to match the current menu icon and description.

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 a 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.

[github-actions]

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

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Source	Preview	Production	What Changed
organizations/managing-peoples-access-to-your-organization-with-roles/about-custom-organization-roles.md	ghec ghes@ 3.15 3.14	ghec ghes@ 3.15 3.14
organizations/managing-oauth-access-to-your-organizations-data/approving-oauth-apps-for-your-organization.md	fpt ghec	fpt ghec	from reusable
organizations/managing-oauth-access-to-your-organizations-data/denying-access-to-a-previously-approved-oauth-app-for-your-organization.md	fpt ghec	fpt ghec	from reusable
organizations/managing-oauth-access-to-your-organizations-data/disabling-oauth-app-access-restrictions-for-your-organization.md	fpt ghec	fpt ghec	from reusable
organizations/managing-oauth-access-to-your-organizations-data/enabling-oauth-app-access-restrictions-for-your-organization.md	fpt ghec	fpt ghec	from reusable

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

[nguyenalex836]

@akordowski Thanks so much for opening a PR with this fix! I'll update the branch and get this merged once tests are passing 🍏

[github-actions]

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