chore: update changeset set to add a bit more detail

Author: kanej

.changeset/slow-lobsters-watch.md

@@ -2,4 +2,4 @@
 "@nomicfoundation/ignition-ui": patch
 ---
 
-Fix for mermaid centering on v3
+Fix for mermaid diagram centering in visalization report [#6409](https://github.com/NomicFoundation/hardhat/issues/6409).