Updated broken link to awesome-copilot README.prompts.md

[johnlokerse]

Why:

Fixes broken links.

Closes: #41168

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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Table of review links

Note: Please update the URL for your staging server or codespace.

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/tutorials/customization-library/prompt-files/create-readme.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/document-api.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/generate-unit-tests.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/onboarding-plan.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/review-code.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/your-first-prompt-file.md	fpt ghec	fpt ghec	from reusable
copilot/how-tos/configure-custom-instructions/add-repository-instructions.md	fpt ghec	fpt ghec	from reusable
copilot/tutorials/customization-library/prompt-files/index.md	fpt ghec	fpt ghec	from reusable

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

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[Copilot]

Pull Request Overview

This PR updates external links to the Awesome GitHub Copilot Customizations repository to reflect a path change in that repository's structure.

• Updated the path from README.prompts.md to docs/README.prompts.md in two reusable content files

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
data/reusables/copilot/prompt-files-preview-note.md	Updated external link path in preview note reusable
data/reusables/copilot/prompt-files-further-reading.md	Updated external link path in further reading reusable

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[Sharra-writes]

@johnlokerse Looks correct, thanks! I'll get it merged.

[github-actions]

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