Add troubleshooting for PlantUML configuration
What does this MR do and why?
Document why rendered diagram PNG URL is not getting updated.
This came out of investigating a customer ticket (internal link): https://gitlab.zendesk.com/agent/tickets/542987
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How to set up and validate locally
- Set up GitLab and PlantUML servers on the same network
- Add a Markdown file of the PlantUML example to a respository
- Enable PlantUML integration and check that the PlantUML diagram is rendered
- Update the PlantUML in Admin Area settings to a different URL, refresh the page and see it does not get updated
- Follow the troubleshooting steps to render the new URL
Edited by Daphne Kua