Fix missing note that downloaded source code checksums may change

The download section mentions checksums can change, but doesn't explain why this matters for users who verify file integrity.

Location https://docs.gitlab.com/ee/user/project/repository/

Current Text "The checksums of generated archives can change even if the repository itself doesn’t change. For example, this occurs if Git or a third-party library that GitLab uses changes."

Suggested Fix Add warning: "This means you should not rely on checksums to verify that two downloads of the same repository are identical. For cryptographic verification, use signed commits or tags instead."

Why This Helps Users who need to verify file integrity understand the limitations.

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