Improve Jira connect-app docs
What does this MR do and why?
Update the prerequisites of documentation "Connect the GitLab.com for Jira Cloud app for self-managed instances".
To be able to connect Jira with the self-managed Gitlab instance, the namespace must be publicly reachable. Jira is unable to link private or internal repositories. It's important to mention that.
In my company we spend a lot of time to understand why we are not able to link yours projects to jira. Due to security approach, all projects are private or internal.
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