Correct tag name restrictions documentation
What does this MR do and why?
Changes tag name restrictions documentation to align with actual behaviour.
The code requires a / at the end for each documented string to be invalid.
https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/git_ref_validator.rb#L9
https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/checks/tag_check.rb#L83
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Edited by Fred Reinink