docs: add port and useSsl options and set default value for hostname …

[Anefu]

…and usePathStyle #461

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Description

These changes add the new options for GitLab Registry provided by #448

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• Closes Improve docs to add GitLab custom registry information #461
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[christophenne]

Classic, forgot about the docs - thanks for your PR @Anefu.

Now that I back-checked with the implementation, I think there might be a mistake there (useSsl should probably be default true, and hostname a nullable string). However let's go with this for now, I will have closer look again on monday back at work.