fix(docs): mmd detection

docs/stateDiagram.md

@@ -403,7 +403,18 @@ stateDiagram
 
 Comments can be entered within a state diagram chart, which will be ignored by the parser. Comments need to be on their own line, and must be prefaced with `%%` (double percent signs). Any text after the start of the comment to the next newline will be treated as a comment, including any diagram syntax
 
-```mmd
+```mermaid-example
+stateDiagram-v2
+    [*] --> Still
+    Still --> [*]
+%% this is a comment
+    Still --> Moving
+    Moving --> Still %% another comment
+    Moving --> Crash
+    Crash --> [*]
+```
+
+```mermaid
 stateDiagram-v2
     [*] --> Still
     Still --> [*]