Update download-rate-limit.md

[RomainBelorgey]

Add information about docker-rateLimit-source Header

Proposed changes

New header docker-rateLimit-source is available when checking the limit on docker hub. Let me know if it is enough or need more information / better explanation

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[thaJeztah]

I suggested some changes for using a real IP (I made it up, but makes it feel more real, IMO)

Perhaps we should use IP-addresses from rfc5737, which documents IP-address ranges for documentation purposes.

[RomainBelorgey]

Yes sorry for the late modifications, should have been done earlier

[usha-mandya]

@thaJeztah Are you OK for us to merge this?

[docker-robott]

Thanks for the pull request. We'd like to make our product docs better, but haven’t been able to review all the suggestions. As our docs have also diverged, we do not have the bandwidth to review and rebase old pull requests.

If the updates are still relevant, review our contribution guidelines and rebase your pull request against the latest version of the docs, then mark it as fresh with a /remove-lifecycle stale comment. If not, this pull request will be closed in 30 days. This helps our maintainers focus on the active pull requests.

Prevent pull requests from auto-closing with a /lifecycle frozen comment.

/lifecycle stale