(Feature request) Add link to Mermaid diagram docs

[meichthys]

Describe feature

It would be nice to have a link to the mermaid diagram docs somewhere on the mermaid diagram notes.
I often need to reference the syntax when building diagrams.

Docs: http://mermaid.js.org/intro/syntax-reference.html

I would suggest adding an informational button like below:

Additional Information

No response