Update availability status for Actions verified creators in GHEC DR

[jczimskey]

Removes the feature availability (or unavailability) of Restricting GitHub Actions policies to verified creators, as it is now available

Why:

Closes: https://github.com/github/proxima/issues/4034

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

A single line in the feature availability table has been removed

Check off the following:

• [x ] 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.
• [x ] The changes in this PR meet the docs fundamentals that are required for all content.
• [x ] All CI checks are passing and the changes look good in the review environment.

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Pull Request Overview

This PR updates the feature availability documentation for GitHub Enterprise Cloud with Data Residency by removing a feature that is now available. The change removes the entry for "Restricting GitHub Actions policies to verified creators" from the unavailable features table, indicating this feature is no longer restricted in the data residency environment.

• Removes outdated availability restriction for GitHub Actions policy verification feature

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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
admin/data-residency/feature-overview-for-github-enterprise-cloud-with-data-residency.md	ghec	ghec

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

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