Docs: Gitaly server-side repository backup documentation has outdated S3 parameters

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Problem to solve

The Gitaly Documentation on enabling server-side S3 backups uses outdated parameters such as disabledSSL instead of disable_https.

Further details

Using the example given causes a difficult to diagnose crash when deploying with Helm.

Proposal

The documentation could be updated to reference the new parameters, particularly s3ForcePathStyle to use_path_style and the aforementioned disable_https.

Who can address the issue

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