Use absolute link

[mccoyp]

Description

@l0lawrence let me know if relative links are preferred for Copilot, but this is resolving a nightly link check failure.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull Request Overview

This PR updates a documentation link in the Copilot instructions file to use an absolute GitHub URL instead of a relative path. This change improves accessibility by ensuring the SDK Release documentation link works consistently regardless of where the instructions are viewed.