/fix-mermaid

Fix the mermaid syntax in .md file

Check that the following rules are satisfied and fix them otherwise for the file

# Mermaid hints

## General Rules
- **DO NOT use `<br>` or `<br/>` tags** in node labels - use natural text wrapping or simple separators like commas (`,`) or hyphens (`-`)
- **Avoid HTML entities in arrows**: Use literal arrow syntax (`->>`, `-->`) not HTML entities (`-&gt;&gt;`)
- **Wrap paths in quotes**: For file paths like `path/to/file`, use quotes: `["path/to/file"]`
- **No HTML formatting**: Keep labels simple and readable
- **Check that code blocks use three backticks** (not XML tags)
- **Don't prefix...