Improve Jira connect-app docs
What does this MR do and why?
This adds a sentence to the Jira connect app setup documentation stating that the GitLab user must at least have maintainer access to the namespace to be linked.
This information is already included in the introduction section (3rd sentence) but might be good to point it out in the specific setup step too.
Related issue: #385346 (comment 1227245858)
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