Improve layout of generated PlantUML diagram (arrows overlapping)

[Aradhana2803]

Summary

In the Concerto documentation (Introduction page), the generated PlantUML diagram for the example model has overlapping arrows and connectors, which makes it difficult to read.

Steps to Reproduce

1. Go to https://docs.accordproject.org/docs/intro (or view locally)
2. Scroll to the "generated PlantUML diagram" section.
3. Observe that several arrows cross each other and overlap labels.

Expected Behavior

The UML diagram should have properly spaced arrows that do not overlap text or boxes, improving readability.

Screenshots

Possible Fix

-This might be fixed by adjusting PlantUML layout directives or CSS that renders the diagram (e.g. using left to right direction, or spacing attributes).

• Regenerate or update the diagram for better layout.

Labels suggestion

documentation, enhancement, good first issue

[Aradhana2803]

Hi! I noticed this visual issue in the docs and would love to work on improving it.
May I take this up?